ATmega1280

ATmega640/1280/1281/2560/2561 Complete
(file size: 7.37MB, 447 pages, revision P, updated: 10/2012)

ATmega640/1280/1281/2560/2561 Summary
(file size: 1.05MB, 40 pages, revision P, updated: 10/2012)

Atmel AT1244: DALI Slave Reference Design
(file size: 368KB, 19 pages, revision A, updated: 02/2013)

This application shows DALI slave LED module function that compliant with standard IEC62386.
Stack is in common->services folder, drivers in mega->drivers, and others are application.
The slave should be controlled by master.

Atmel AT1886: Mixing Assembly and C with AVRGCC
(file size: 140KB, 8 pages, revision B, updated: 11/2012)

This application note describes how to mix both C and assembly code in an AVRGCC project using Atmel Studio 6 IDE. The application note is written from the perspective that C is the language of choice and assembly language is included in situations where it is either necessary or convenient.

Atmel AVR057: Internal RC Oscillator Calibration for ATtiny4/5/9/10/20/40
(file size: 468KB, 13 pages, revision A, updated: 10/2012)

This application note provides a method to calibrate the internal RC oscillator of the devices ATtiny4/5/9/10/20/40 which supports TPI programming. The calibration is done with the AVR918 (Using the Atmel TPI) as the hardware frontend and with AVR911 (AVROSP) as the software frontend

Atmel AVR116: Wear Leveling on DataFlash
(file size: 629KB, 25 pages, revision A, updated: 07/2012)

This application note describes the use of the Flash Translation Layer (FTL) interface. It describes the features, structure and interface of the FTL library, and how to use this library in Atmel Studio. Flash memory has a limited program/erase lifecycle and programming and erasing the same block many times will result in bad blocks and shortened flash memory life. The intermediate software layer, FTL, addresses this issue.

Atmel AVR1200: Using External Interrupts for megaAVR Devices
(file size: 166540, 12 pages, revision A, updated: 12/2011)

This application note illustrates the functionality and configuration steps (usage) of the external interrupts available on Atmel® megaAVR® family of Atmel AVR® Microcontrollers. The application note also describes the points to be considered while using a GPIO pin as an external interrupt source pin.

Atmel AVR1201: Using External Interrupts for tinyAVR Devices
(file size: 142260, 12 pages, revision A, updated: 12/2011)

This application note illustrates the functionality and configuration steps (usage) of the external interrupts available in Atmel® tinyAVR® family of Atmel AVR® Microcontrollers. The application note also describes the points to be considered while using a GPIO pin as an external interrupt source pin.

Atmel AVR126: ADC of megaAVR in Single Ended Mode
(file size: 237569, 14 pages, revision A, updated: 10/2011)

This application note describes the basic functionality of the ADC in Atmel® megaAVR® devices in Single ended mode with code examples on ATmega88 to get started. The code examples are written in 'C' language and have been tested on the Atmel STK®600 starter kit for functionality.

Atmel AVR127: Understanding ADC parameters
(file size: 261447, 20 pages, revision A, updated: 11/2011)

This application note discusses about the basic concepts of analog-to-digital converter (ADC) and the various parameters that determine the performance of an ADC. These ADC parameters are of good importance since they are a part of deciding the accuracy of the ADC's output.

Atmel AVR1632: ASF - Atmel QTouch with XMEGA USB HID
(file size: 1251KB, 14 pages, revision A, updated: 07/2012)

This application note describes how to use the QTouch library with the ATxmega256A3BU microcontroller using QTouch button available on XMEGA-A3BU Xplained board. QTouch sensor status is acquired and reported over the USB HID class to a host PC. It provides a single chip solution for sensing QTouch through USB interface.

Atmel AVR211: Wafer Level Chip Scale Packages
(file size: 533KB, 12 pages, revision A, updated: 07/2012)

Wafer Level Chip Scale Packaging (WLCSP) refers to the technology of packaging an integrated circuit at wafer level, resulting in a device practically the same size as the die. WLCSP technology allow devices to be integrated in the design using the smallest possible form factor.

Atmel AVR231: AES Bootloader
(file size: 363KB, 31 pages, revision E, updated: 03/2012)

This application note describes how firmware can be updated securely on AVR microcontrollers with bootloader capabilities. The method uses the Advanced Encryption Standard (AES) to encrypt the firmware.

Atmel AVR262: Atmel QTouch with USB HID
(file size: 3045577, 15 pages, revision A, updated: 03/2011)

This application note illustrates how to use the Atmel®QTouch®Library on the Atmel® AT90USB646 microcontroller to provide a single-chip solution for QTouch sensing through a USB interface. Touch sensor status is acquired and reported over the USB HID class to a host PC.

Atmel AVR291: 8MHz Internal Oscillator Calibration for USB Low Speed on Atmel ATmega32U4RC
(file size: 9439409, 12 pages, revision A, updated: 11/2011)

This application note describes a fast and accurate method for calibrating the internal RC oscillator on the Atmel® ATmega32U4RC MCU. It offers simple and flexible calibration firmware source code, which allows device runtime calibration to for maintaining USB low-speed data transfers within the USB specification (1.5MHz±1.5%).

Atmel AVR364: MEGA-1284P Xplained Hardware User Guide
(file size: 324139, 15 pages, revision B, updated: 11/2011)

The Atmel® MEGA-1284P Xplained evaluation kit is a hardware platform for evaluating the ATmega1284P MCU. The kit offers a large range of features that enable the megaAVR® user to get started using megaAVR peripherals right away and to get an understanding of how to integrate a megaAVR MCU in their own design.

Atmel AVR370: MEGA-1284P Xplained Getting Started Guide
(file size: 371110, 13 pages, revision A, updated: 04/2011)

The Atmel® MEGA-1284P Xplained evaluation kit is a hardware platform to evaluate the Atmel ATmega1284P microcontroller.

The kit offers a range of features that enables the Atmel megaAVR® user to get started using megaAVR peripherals right away and understand how to integrate the megaAVR device in their own design. This getting started guide will take you through all the basic steps needed to start using the MEGA-1284P Xplained evaluation kit.

Atmel AVR4019: Light and Proximity One (ATAVRSBLP1) Hardware Users Guide
(file size: 920575, 7 pages, revision A, updated: 12/2011)

The Atmel® AVR® Sensors Xplained series of development boards and software from Atmel are designed to be plug in compatible with the Atmel AVR Xplained series of MCU boards for the Atmel AVR microcontroller family, providing you access to a wide range of microcontroller performance depending on the needs of your application.

Atmel AVR4027: Tips and Tricks to Optimize Your C Code for 8-bit AVR Microcontrollers
(file size: 38656, 18 pages, revision A, updated: 11/2011)

This application note covers some basic tips on C code optimization using avr-gcc. Both code and size optimization tips are described.

Atmel AVR4900: ASF - USB Device Stack
(file size: 198953, 22 pages, revision C, updated: 09/2011)

This application note introduces the Atmel® USB device stack. The stack is included in the Atmel Software Framework (ASF), and aims to provide the customer with the quickest and easiest way to build a USB application.

Atmel AVR4902: ASF - USB Composite Device
(file size: 631903, 13 pages, revision A, updated: 10/2011)

This application note provides an easy way to integrate a USB composite device application on a new or an existing project.

Atmel AVR4903: ASF - USB Device HID Mouse Application
(file size: 244066, 13 pages, revision A, updated: 09/2011)

This application note provides an easy way to integrate a USB mouse device application on a new or existing project.

Atmel AVR4904: ASF - USB Device HID Keyboard Application
(file size: 449094, 15 pages, revision A, updated: 10/2011)

This application note provides an easy way to integrate a USB keyboard device application on a new or an existing project.

Atmel AVR4907: ASF - USB Device CDC Application
(file size: 683697, 22 pages, revision A, updated: 11/2011)

This application note provides an easy way to integrate a USB CDC device application on a new or an existing project.

Atmel AVR4960: USB Host Android Accessory
(file size: 135KB, 8 pages, revision C, updated: 08/2012)

This document introduces the Android Open Accessory Protocol for Atmel® microcontrollers. The library and examples are included in the Atmel AVR® Software Framework (ASF) to provide the customer with a quick and easy way to get started with developing an Android accessory. The existing demos are described in the Atmel AVR32848: Android Accessory Demo.

Atmel AVR544: Migrating megaAVR USB projects to Atmel AVR Studio 5/6
(file size: 955KB, 10 pages, revision A, updated: 04/2012)

This application note describes how to migrate the megaAVR USB packages from AVR Studio 4 to AVR Studio 5.1 or Atmel Studio 6.

Atmel AVR600: STK600 Expansion, Routing and Socket
(file size: 725KB, 23 pages, revision C, updated: 04/2013)

This application note describes the process of developing new routing, socket and expansion cards for the STK600. It also describes the physical parameters for creating such cards.

Atmel AVR675: Configurable Three Phase BLDC Fan
(file size: 1.4MB, 34 pages, revision B, updated: 12/2012)

This application note describes the implementation and use of a configurable 3-phase brushless DC (BLDC) fan using the ATtiny461A microcontroller implementing sensorless control.

Atmel AVR911: AVR Open-source Programmer for tinyAVR and megaAVR devices
(file size: 221KB, 16 pages, revision B, updated: 10/2012)

The AVR Open-source Programmer (AVROSP) is an AVR programmer application that replaces the AVRProg tool included in AVR Studio. It is a command-line tool, using the same syntax as the STK500 and JTAGICE command-line tools in AVR Studio.

Atmel AVR944: Atmel LED Driver Library for 8-bit AVR
(file size: 74421, 13 pages, revision A, updated: 11/2011)

Atmel MSLxxxx is a series of compact, high power LED drivers. This application note explains how to use 8-bit Atmel AVR® microcontrollers to interface with these LED drivers. MSLxxxx series of drivers feature either TWI or SPI interface to read and write to their internal registers. Atmel LED driver library provides easy to use wrapper functions to read/write to those registers using any 8-bit AVR as master. This library supports both TWI and SPI interfaces.

Atmel AVR947: Single-Wire Bootloader for any MCU with Self Programming Capability
(file size: 241KB, 19 pages, revision A, updated: 01/2013)

This application note discusses a bootloader specifically designed for devices lacking a separate bootloader section and any hardware communication modules. This design does not require any chip resources like TWI, SPI or UART modules. Instead, it implements a single-wire UART (as described in the Atmel® AVR®274: Single-wire Software UART, application note) in software, which requires only one general purpose IO-pin.

AVR041: EMC Performances Improvement for ATmega32M1
(file size: 279785, 6 pages, revision A, updated: 02/2008)

Thanks to a new Atmel IC design methodology, the EMC constraints are taken into account earlier in the IC design phase. The EMC performances of the Mega32M1 product are improved thanks to some design improvements detailed in this document.

AVR054: Run-time calibration of the internal RC oscillator via the UART
(file size: 167781, 17 pages, revision C, updated: 04/2008)

This application note describes how to calibrate the internal RC oscillator via the UART. In the method used a slave node is synchronized to a master node at the beginning of every message frame.

AVR055: Using a 32kHz XTAL for run-time calibration of the internal RC
(file size: 150049, 16 pages, revision D, updated: 07/2008)

This application note describes a fast and accurate way to calibrate the internal RC oscillator using an external 32.768 kHz crystal as input to an asynchronous Timer/Counter.

AVR063: LCD Driver for the STK504
(file size: 120411, 13 pages, revision A, updated: 04/2006)

The STK504 is a hardware expansion board for STK500 that add support for 100 pin AVR LCD devices. This application note is an example of how to use the ATmega3290 and the STK504.

AVR067: JTAGICE mkII Communication Protocol
(file size: 327125, 69 pages, revision D, updated: 11/2009)

This document describes the communication protocol used between AVR Studio and JTAGICE mkII.

AVR068: STK500 Communication Protocol
(file size: 161607, 37 pages, revision C, updated: 06/2006)

The document describes version 2.0 of the Atmel STK500 and the PC controlling the STK500 communication protocol. The firmware is distributed with AVR Studio 4.11 build 401 or later.

AVR069: AVRISP mkII Communication Protocol
(file size: 326430, 24 pages, revision B, updated: 02/2006)

This document describes the AVRISP mkII protocol. The firmware is distributed with AVR Studio 4.12 or later.

AVR077: Opto Isolated Emulation for the DebugWIRE
(file size: 236072, 9 pages, revision A, updated: 01/2008)

This application note describes how to implement an optoisolated interface for the DebugWIRE. This device could help the debug of applications with non isolated power supply like ballast, motors, vacuum cleaners, refrigerators, etc.

AVR078: STK524 User Guide
(file size: 4671063, 20 pages, revision A, updated: 02/2008)

The STK524 kit is made of the STK524 board, AVRCANAdapt and AVRLINAdapt boards. The STK524 board is a top module for the STK500. It is designed to support the ATmega32M1, ATmega32C1 products and future compatible derivatives.

AVR079: STK600 Communication Protocol
(file size: 504628, 61 pages, revision A, updated: 04/2008)

This document describes the STK600 protocol. The firmware is distributed with AVR Studio 4.14 or later.

AVR1016: AVR Training QTouch Xplained
(file size: 307506, 18 pages, revision A, updated: 05/2010)

The purpose of this training is to get familiar with the Atmel QTouch Library 4.0 and how to use it in your own applications.

AVR103: Using the EEPROM Programming Modes on tinyAVR and megaAVR devices
(file size: 77447, 5 pages, revision A, updated: 03/2005)

This application note implements a driver utilizing the programming modes available for the EEPROM in some tinyAVR and megaAVR devices, involving both time and power savings.

AVR106: C functions for reading and writing to Flash memory on tinyAVR and megaAVR devices
(file size: 49401, 10 pages, revision B, updated: 08/2006)

This application note provides C functions for accessing the Flash memory using the Self programming Program memory which allows to reprogram the Flash memory during program run.

AVR107: Interfacing AVR microcontrollers with serial memories
(file size: 496998, 22 pages, revision A, updated: 03/2005)

This application note describes the functionality and the architecture of SPI serial memories drivers as well as the motivation of the selected solution.

AVR114: Using the ATMEL File System management for AT32UC3x, AT90USBx and ATmega32U4
(file size: 236064, 22 pages, revision A, updated: 09/2008)

This application note describes the File System module which is optimized for the AVR core, leading to a small footprint and high bandwidth. It provides many features such as opening multiple files at the same time or play list management.

AVR115: Data Logging with Atmel File System on ATmega32U4
(file size: 478221, 10 pages, revision A, updated: 01/2009)

This application note describes how to use the Atmel file system (see AVR114) to perform data logging operation on the ATmega32U4.

AVR121: Enhancing ADC resolution by oversampling
(file size: 120791, 14 pages, revision A, updated: 09/2005)

This Application Note explains the method called "Oversampling and Decimation" and which conditions need to be fulfilled to make this method work properly to achieve a higher resolution without using an external ADC.

AVR122: Calibration of the tinyAVR internal temperature reference
(file size: 307913, 14 pages, revision A, updated: 02/2008)

This application note describes how to calibrate and compensate the temperature measurements from the ATtiny25/45/85. It can also be used on other AVR microcontrollers with internal temperature sensors.

AVR135: Using Timer Capture to Measure PWM Duty Cycle on tinyAVR and megaAVR devices
(file size: 84869, 12 pages, revision A, updated: 10/2005)

This application note describes how the pulse width and period of a signal may be computed using the Input Capture Unit (ICP).

AVR136: Low-jitter Multi-channel Software PWM
(file size: 27896, 5 pages, revision A, updated: 05/2006)

This application note shows how an multi-channel software pulse-width modulation can be implemented. The implementation uses an 8-bit timer with overflow interrupt to generate 10 PWM channels with very low jitter.

AVR151: Setup and use of the SPI on tinyAVR and megaAVR devices
(file size: 262508, 15 pages, revision C, updated: 07/2008)

This application note describes how to setup and use the on-chip Serial Peripheral Interface (SPI) of the tinyAVR and megaAVR devices.

AVR1511: QT600-ATxmega128A1 Training Guide
(file size: 1221185, 36 pages, revision B, updated: 08/2011)

The purpose of this training is to get familiar with the Atmel®QTouch Suite™ for developing and debugging any Atmel touch application. It includes four core solutions: Atmel QTouch Studio, Atmel QT600 development kit, Atmel QTouch Library, and Atmel®AVR Studio®.

AVR153: USB PC Drivers Based on Generic HID Class
(file size: 448746, 10 pages, revision B, updated: 07/2008)

This document gives information on integrating the Atmel USB HID DLL functions. Simple code examples that demonstrate different types of implementation are given.

AVR155: Accessing I2C LCD Display Using the tinyAVR and megaAVR 2-Wire Serial Interface
(file size: 93971, 10 pages, revision B, updated: 09/2005)

This application note includes a 2-wire/TWI driver for bus handling and describes how to access a Philips I2C LCD driver on a Batron LCD display.

AVR181: Automotive Grade0 - PCB and Assembly Recommendations
(file size: 112200, 8 pages, revision A, updated: 09/2007)

This paper is a collection of technical advice aiming at providing automotive electronic designers elements to manage high temperature constraints when addressing the PCB development.

AVR186: Best practices for the PCB layout of Oscillators
(file size: 92401, 4 pages, revision A, updated: 03/2008)

This application note provides guidelines to design the PCB layout in order not to risk failure and unstable oscillator operation.

AVR1908: QTouch Xplained Hardware User Guide
(file size: 1655285, 5 pages, revision A, updated: 05/2010)

The kit demonstrates how a QTouch solution requires only a very simple circuit design and a minimum of external components. It includes support for eight QTouch channels: a slider (3 channels), a wheel (3 channels) and two keys (1 channel each).

AVR1921: Reprogramming the Xplain AT90USB1287 and ATxmega128A1 firmware
(file size: 2474237, 8 pages, revision A, updated: 05/2010)

This application note describes how to reprogram the AT90USB1287 and the ATxmega128A1 on the Xplain board with the original firmware, or your own application code.

AVR1922: Xplain Board Controller Firmware
(file size: 22097618, 6 pages, revision A, updated: 05/2010)

The Xplain board controller, an AT90USB1287, is in charge of some of the low-level tasks on boards in the Xplain series. The board controller improves usability of the main microcontroller, and adds features the main controller lacks, like USB.

AVR205: Frequency measurement made easy with Atmel tinyAVR and Atmel megaAVR
(file size: 67905, 14 pages, revision A, updated: 02/2011)

This application note describes how to measure frequency of any type of waveform: sine, square etc. with variable duty cycle. A basic requirement for the signal is to have amplitude that is within the I/O pin threshold for the selected Atmel® AVR® device.

AVR221: Discrete PID controller on tinyAVR and megaAVR devices
(file size: 97986, 10 pages, revision A, updated: 05/2006)

This application note describes a simple implementation of a discrete Proportional-Integral-Derivative (PID) controller on tinyAVR and megaAVR devices.

AVR241: Direct driving of LCD display using general I/O on tinyAVR and megaAVR devices
(file size: 55796, 11 pages, revision A, updated: 04/2004)

This application note describes software driving of LCDs with one common line, using the static driving method.

AVR245: Code Lock with 4x4 Keypad and I2C LCD on a tinyAVR
(file size: 151554, 9 pages, revision A, updated: 10/2005)

This application note describes how to build a code lock with an tinyAVR and a handful of components. The code lock uses a 4x4 keypad for user input, a piezoelectric buzzer for audible feedback and an LCD for informational output.

AVR270: USB Mouse Demonstration on megaAVR with USB
(file size: 4623094, 11 pages, revision C, updated: 07/2008)

This application note describes a simple mouse project. It allows users to quickly test USB hardware using megaAVR with USB without any driver installation.

AVR271: USB Keyboard Demonstration on megaAVR with USB
(file size: 2457308, 12 pages, revision B, updated: 07/2008)

This application note describes how to start and implement a USB keyboard application using the STK525 starter kit and FLIP in-system programming software for megaAVR with USB.

AVR272: USB CDC Demonstration: UART to USB Bridge, on megaAVR with USB
(file size: 3718440, 11 pages, revision B, updated: 04/2008)

This application note describes how to start and implement a CDC (Virtual Com Port and UART to USB bridge) application using the STK525 starter kit and FLIP in-system programming software for megaAVR with USB.

AVR273: USB Mass Storage Implementation on megaAVR with USB
(file size: 6268511, 23 pages, revision A, updated: 03/2006)

This application note describes how to start and implement a USB application based on the Mass Storage (Bulk only) class to transfer data between a PC and user equipment on megaAVR with USB.

AVR274: Single-wire Software UART on tinyAVR and megaAVR devices
(file size: 136296, 14 pages, revision A, updated: 03/2007)

This application note describes a software implementation of a single wire UART. The protocol supports half duplex communication between two devices. The only requirement is an I/O port supporting external interrupt and a timer compare interrupt.

AVR275: Sensor-based Control of Three Phase Brushless DC Motors Using 8-bit AVR USB microcontrollers
(file size: 8792967, 10 pages, revision A, updated: 09/2006)

This application note described the control of a BLDC motor with Hall effect position sensors (referred to simply as Hall sensors). The implementation includes both direction and open loop speed control.

AVR276: USB Software Library for megaAVR with USB Microcontrollers
(file size: 10255299, 27 pages, revision A, updated: 01/2007)

This application note describes the USB software library for megaAVR with USB and illustrates how to develop a USB device or reduced host applications using this library.

AVR277: On-The-Go (OTG) add-on to USB Software Library for megaAVR with USB
(file size: 197131, 15 pages, revision A, updated: 07/2007)

This application note describes the new features brought by the OTG working group and how they are integrated in the USB software library for megaAVR with USB, illustrating how to develop customizable USB OTG applications.

AVR280: USB Host CDC Demonstration on megaAVR with USB
(file size: 1684150, 14 pages, revision A, updated: 09/2007)

This application note describes how to start and implement a Host CDC application using the STK525 or USBKEY starter kit, and finally introduces a simple example of dual USB-UART bridge between two PCs.

AVR282: USB Firmware Upgrade for megaAVR with USB
(file size: 754660, 13 pages, revision A, updated: 01/2008)

This application note describes how to perform the firmware upgrade of the megaAVR with USB products using the on-chip bootloader and FLIP software.

AVR286: LIN Firmware Base for AVR microcontrollers with LIN/UART Controller
(file size: 11054, 19 pages, revision A, updated: 03/2008)

This application note provides low-level drivers for LIN communication on ATtiny87/167 or ATmega32M1/32C1/64M1/64C1.

AVR287: USB Host HID and Mass Storage Demonstration
(file size: 18549385, 11 pages, revision A, updated: 09/2009)

This application note describes how to start and implement a USB host application based on the USB HID class (USB mouse) and Mass Storage class and introduces a simple example of an megaAVR with USB managing both USB classes and a file system.

AVR292: LIN Break-in-Data Feature for AVR microcontrollers with LIN/UART Controller
(file size: 117662, 8 pages, revision A, updated: 03/2008)

This document describes the behavior of the LIN/UART Controller when it detects an unexpected BREAK field during an otherwise normal LIN transfer. This event is referred to as "Break-in-Data".

AVR293: USB Composite Device on megaAVR with USB
(file size: 10031062, 9 pages, revision A, updated: 08/2008)

This document describes how to start and implement a composite device application on megaAVR with USB.

AVR296: AVRUSBRF01 USB RF Dongle User Guide
(file size: 2522973, 11 pages, revision A, updated: 07/2008)

This kit is a USB dongle designed to demonstrate wireless communications. It is powered by the AT90USB162 AVR microcontroller.

AVR303: SPI-UART Gateway on tinyAVR and megaAVR devices
(file size: 58890, 5 pages, revision A, updated: 03/2005)

The SPI-UART Gateway application runs on the ATmega8 and allows the developer to test and debug an SPI slave application isolated from the master, using manually controlled communications via a suitable RS232 terminal.

AVR309: Software Universal Serial Bus (USB)
(file size: 3200552, 23 pages, revision B, updated: 02/2006)

This application note describes the USB implementation in a low-cost microcontroller through emulation of the USB protocol in the firmware. Supports Low Speed USB (1.5 Mbit/s) in accordance with USB2.0.

AVR310: Using the USI module as a I2C master on tinyAVR and megaAVR devices
(file size: 128819, 8 pages, revision B, updated: 09/2004)

This Application Note describes how to use the USI for TWI master communication on tinyAVR and megaAVR devices.

AVR311: Using the TWI module as I2C slave on tinyAVR and megaAVR devices
(file size: 17431, 12 pages, revision D, updated: 08/2009)

This application note describes a TWI slave implementation, in form of a fullfeatured driver and an example of usage for this driver.

AVR312: Using the USI module as a I2C slave on tinyAVR and megaAVR devices
(file size: 81217, 9 pages, revision C, updated: 09/2005)

This Application Note describes how to use the USI for TWI slave communication on tinyAVR and megaAVR devices.

AVR315: Using the TWI module as I2C master on tinyAVR and megaAVR devices
(file size: 299785, 14 pages, revision C, updated: 02/2010)

This Application Note describes a TWI master implementation, in form of a fullfeatured driver and an example of usage for this driver.

AVR316: SMBus Slave Using the TWI Module on tinyAVR and megaAVR devices
(file size: 133088, 20 pages, revision A, updated: 10/2005)

This application note provides background information on the SMBus specification and the 8-bit AVR TWI module, an interrupt-driven SMBus slave driver and a sample implementation.

AVR318: Dallas 1-Wire master on tinyAVR and megaAVR devices
(file size: 131834, 21 pages, revision A, updated: 09/2004)

This application note shows how a 1-Wire master can be implemented on an 8-bit AVR, either in software only, or utilizing the U(S)ART module.

AVR319: Using the USI module for SPI communication on tinyAVR and megaAVR devices
(file size: 148841, 8 pages, revision A, updated: 09/2004)

This application note describes a SPI interface implementation, in form of a fullfeatured driver and an example of usage for this driver.

AVR322: LIN Protocol Implementation on megaAVR Microcontrollers
(file size: 213740, 21 pages, revision A, updated: 12/2005)

The LIN protocol is introduced in this application note, along with its implementation on Atmel Automotive AVR microcontrollers.

AVR323: Interfacing GSM modems with tinyAVR and megaAVR devices
(file size: 253551, 21 pages, revision A, updated: 02/2006)

This application note describes how to use a tinyAVR or megaAVR device to control a GSM modem in a cellular phone. The interface between modem and host is a textual protocol called Hayes AT-Commands.

AVR32798: EXTBT User Guide
(file size: 7872363, 16 pages, revision A, updated: 11/2010)

The Atmel® EXTBT is a Bluetooth extension module for Atmel® AVR® development kits. The kit is equipped with the FREE2MOVE™ F2M03GXA Bluetooth module and provides Bluetooth functionality through a UART interface to any AVR devices. This guide shows the user how to quickly get started with this kit and describes the EXTBT hardware.

AVR328: USB Generic HID Implementation on megaAVR devices
(file size: 4013212, 13 pages, revision C, updated: 07/2008)

The aim of this document is to describe how to start and implement a USB application, based on the HID class, to transfer data between a PC and user equipment, using USB megaAVR devices.

AVR32917: Getting started with the picoPower Board
(file size: 1242375, 16 pages, revision A, updated: 12/2009)

This application note describes the picoPower function of ATmega48PA, ATxmega32A4 and AT32UC3L064 and the picoPower Board which purpose is to get familiar with the general power-saving features of AVR microcontrollers.

AVR336: ADPCM Decoder on tinyAVR and megaAVR devices
(file size: 120349, 20 pages, revision A, updated: 11/2004)

This application note focuses on decoding the ADPCM signal, Adaptive Differential Pulse Code Modulation, and turning it to a signal suitable for loudspeakers. It targets an ATmega128 device.

AVR340: Direct Driving of LCD Using General Purpose IO using tinyAVR and megaAVR devices
(file size: 250141, 15 pages, revision A, updated: 09/2007)

This application note describes the operation of a Multiplexed LCD. Also discussed are electrical waveforms and connections needed by a LCD, as well as a C-program to operate the LCD.

AVR341: Four and five-wire Touch screen Controller using tinyAVR and megaAVR devices
(file size: 327215, 19 pages, revision A, updated: 07/2007)

This application note describes how to interface a resistive 4- and 5-wire touch systems with tinyAVR and megaAVR devices which provide an excellent solution thanks to their analog features combined with low power modes.

AVR351: Runtime calibration and compensation of RC oscillators
(file size: 160632, 7 pages, revision A, updated: 10/2008)

This application note explains how to calibrate RC oscillators at operating temperature or runtime if system temperature changes over time, to achieve the best possible accuracy.

AVR352: Using the Coulomb Counting ADC
(file size: 140047, 7 pages, revision B, updated: 02/2009)

This application note describes how to use the CC-ADC to get maximum accuracy and lowest possible current consumption.

AVR353: Voltage Reference Calibration and Voltage ADC Usage
(file size: 166354, 6 pages, revision A, updated: 10/2008)

This application note explains how to calibrate the very accurate low power bandgap voltage reference embedded in some of the new Atmel AVR Smart Battery devices, and used for the internal Voltage ADC and Coulomb Counting ADC.

AVR354: Using the Deep Under-Voltage Recovery Mode (DUVR)
(file size: 79049, 8 pages, revision A, updated: 10/2008)

This application note explains how to charge Li-ion battery cells from a deeply discharged condition and at the same time keep full control of the charging sequence, which is a challenge in many applications.

AVR4013: picoPower Basics
(file size: 16830, 7 pages, revision A, updated: 12/2010)

This application note demonstrates how to extend the battery life of our application by multiple factors by modifying only the firmware. You will see that, while some of the modifications are very simple and only require setting some registers, other modifications will need some rewriting of the code.

AVR4100: Selecting and testing 32kHz crystal oscillators for AVR microcontrollers
(file size: 495623, 24 pages, revision D, updated: 07/2011)

This application note summarizes the crystal basics, PCB layout considerations, and how to test a crystal in your application. A crystal selection guide shows recommended crystals tested by experts and found suitable for various oscillator modules in different Atmel® AVR® families.

AVR411: Secure Rolling Code Algorithm for Wireless Link on tinyAVR and megaAVR devices
(file size: 1635770, 22 pages, revision D, updated: 11/2009)

This application note describes a Secure Rolling Code Algorithm transmission protocol for use in a unidirectional wireless communication system.

AVR414: User Guide - ATAVRRZ502 - Accessory Kit
(file size: 613288, 21 pages, revision B, updated: 12/2006)

This application note describes the ATAVRRZ502 Accessory Kit (RZ502). The RZ502 is designed for evaluation of the Atmel AT86RF230 2.4 GHz radio transceiver. This radio transceiver fully complies with the IEEE 802.15.4 standard.

AVR430: ATAVRMC300 Hardware User Guide
(file size: 3119535, 13 pages, revision C, updated: 10/2008)

The ATAVRMC300 is a general-purpose power stage board able to drive brushless DC, brushed DC and stepper motors. The board is designed to be a flexible platform for developing motor control applications.

AVR433: Power Factor Corrector (PFC) with AT90PWM2/2B Re-triggable High Speed PSC
(file size: 68612, 7 pages, revision A, updated: 03/2006)

This application note explains how to develop a stand alone PFC (Power Factor Corrector) with the AT90PWM2.

AVR434: PSC Cookbook for AT90PWM devices
(file size: 48383, 32 pages, revision A, updated: 10/2006)

This application note is an introduction to the use of the Power Stage Controllers (PSC) available in some AVR microcontrollers like the AT90PWM devices, showing the various modes of operation.

AVR435: BLDC/BLAC Motor Control Using a Sinus Modulated PWM Algorithm on AT90PWM3B
(file size: 519476, 12 pages, revision A, updated: 09/2006)

This application note proposes an implementation of a sinus modulated BLDC/BLAC motor control, based on an ATAVRMC100 board populated with an AT90PWM3B.

AVR441: Intelligent BLDC Fan Controller with Temperature Sensor and Serial Interface
(file size: 581513, 26 pages, revision A, updated: 09/2005)

This application note describes how to integrate a low-cost, feature-rich AVR microcontroller into the commutator electronics of a BLDC fan. The ATtiny25 is used as an example.

AVR442: PC Fan Control using ATtiny13
(file size: 315057, 10 pages, revision A, updated: 09/2005)

This application note describes the operation of 12 volt DC cooling fans typically used to supply cooling air to electronic equipment, and controlling them with the ATtiny13.

AVR443: Sensor-based control of three phase BLDC motor based on tinyAVR and megaAVR devices
(file size: 88858, 8 pages, revision B, updated: 02/2006)

This application note describes the control of a BLDC motor with Hall effect position sensors. The implementation includes both direction and open loop speed control.

AVR444: Sensorless control of 3-phase BLDC motors based on tinyAVR and megaAVR devices
(file size: 251559, 14 pages, revision A, updated: 10/2005)

This application note describes how to implement sensorless commutation control of a 3-phase brushless DC (BLDC) motor with the low cost ATmega48 microcontroller.

AVR446: Linear speed control of stepper motor on tinyAVR and megaAVR devices
(file size: 156293, 15 pages, revision A, updated: 06/2006)

This application note describes how to implement an exact linear speed controller for stepper motors. It also presents a driver with a demo application, capable of controlling acceleration as well as position and speed.

AVR447:Sinusoidal driving of three-phase permanent magnet motor using ATmega48/88/168
(file size: 463914, 26 pages, revision A, updated: 06/2006)

This application note describes the implementation of sinusoidal driving for threephase brushless DC motors with hall sensors. The implementation can easily be modified to use other driving waveforms such as sine wave with third harmonic injected.

AVR448: Control of High Voltage 3-Phase BLDC Motor with an ATmega48
(file size: 144013, 10 pages, revision C, updated: 05/2006)

Using a microcontroller as a control device, 3-phase motors can be used for a wide range of applications. Motor sizes below one horsepower are efficiently controlled in speed, acceleration, and power levels.

AVR449: Sinusoidal driving of 3-phase permanent magnet motor using ATtiny261/461/861
(file size: 275112, 24 pages, revision B, updated: 10/2007)

This application note describes the implementation of sinusoidal driving for threephase brushless DC motors with hall sensors on the ATtiny261/461/861 microcontroller family.

AVR451: BC100 Hardware User Guide
(file size: 1174994, 12 pages, revision A, updated: 09/2007)

The BC100 is reference design/development kit that targets especially battery charging. It can be used to charge various battery types, as long as the requirements to charging voltage and currents are within the output range that the kit offers.

AVR458: Charging Lithium-Ion Batteries with ATAVRBC100
(file size: 1823634, 34 pages, revision B, updated: 08/2008)

This application note is based on the ATAVRBC100 Battery Charger reference design and focuses on how to charge Lithium-Ion (Li-Ion) batteries. The firmware is written entirely in C language and is easy to port to other 8-bit AVR devices.

AVR463: Charging Nickel-Metal Hydride Batteries with ATAVRBC100
(file size: 787524, 26 pages, revision A, updated: 09/2007)

This application note is based on the ATAVRBC100 Battery Charger reference design and focuses on how to use it to charge Nickel-Metal Hydride (NiMH) batteries. The firmware is written entirely in C language and is easy to port to other AVR microcontrollers.

AVR465: Energy Meter using tinyAVR and megaAVR devices
(file size: 308095, 40 pages, revision A, updated: 07/2004)

This application note describes a single-phase power/energy meter with tamper logic. The design measures active power, voltage, and current in a single-phase distribution environment.

AVR471: MC320 Getting Started Guide
(file size: 289527, 7 pages, revision A, updated: 11/2008)

This application note describes the MC320 kit which is a complete hardware system which demonstrates motor control using ATmega32M1 and features CAN and LIN connectivity.

AVR480: Anti-Pinch System for Power Window using tinyAVR and megaAVR devices
(file size: 516455, 19 pages, revision B, updated: 12/2006)

This application note provides an example of how to create an anti-pinch system for power windows. Based on Speed and Current parameters measured out of the window DC motor, it supports the FMVSS118 and 20/64/ECC standards.

AVR481: DB101 Hardware User Guide
(file size: 391205, 10 pages, revision B, updated: 09/2007)

The DB101 is a graphical LCD module. It demonstrates how to use an AVR microcontroller to control a 128x64 pixel graphical LCD.

AVR482: DB101 Software User Guide
(file size: 4482912, 13 pages, revision A, updated: 09/2007)

The DB101 firmware is a complex piece of software that uses a number of drivers and libraries to implement a set of applications to the user. This document gives a brief introduction to every driver, library, and application.

AVR483: DB101 Firmware - Getting Started
(file size: 2202, 17 pages, revision A, updated: 02/2008)

This application explains, step by step, how to create a new firmware project, add the bare essentials for a basic graphics application, build it and run it on the DB101.

AVR487: AVRUSBRF01 Getting Started Guide
(file size: 370702, 8 pages, revision A, updated: 04/2008)

This document describes the AVRUSBRF01 reference design which allows users to build an RF application in a short time and reduce time to market.

AVR492: BLDC Motor control in sensor mode using AT90PWM3/3B
(file size: 1206498, 26 pages, revision B, updated: 05/2007)

This application note describes how to implement a brushless DC motor control in sensor mode using AT90PWM3/3B AVR microcontroller.

AVR493: Sensorless Commutation of BLDC Motor control using AT90PWM3/3B and ATAVRMC100
(file size: 1449093, 20 pages, revision B, updated: 12/2006)

This application note describes how to implement a sensorless commutation of BLDC motors with the ATAVRMC100 developement kit.

AVR494: AC Induction Motor Control Using the constant V/f Principle and a Natural PWM Algorithm
(file size: 78637, 12 pages, revision A, updated: 12/2005)

This application note explains how to control the speed of an induction motor by using variable frequency drives and natural PWM modulation on an AT90PWM3/3B.

AVR495: AC Induction Motor Control Using the Constant V/f Principle and a Space-vector PWM Algorithm
(file size: 78637, 11 pages, revision A, updated: 12/2005)

This application note explains how to control the speed of an induction motor by using variable frequency drives and space vector modulation on an AT90PWM3/3B.

AVR601: Atmel Modular Evaluation Kits for Motor Control Applications
(file size: 2964038, 9 pages, revision A, updated: 10/2008)

This document describes the association between the ATAVRMC300, ATAVRMC301, ATAVRMC303, and ATAVRMC310 processor boards.

AVR916: Upgrading the Flash memory using a U-Disk
(file size: 5507714, 12 pages, revision A, updated: 08/2009)

This application note explains how to perform In System Programming (ISP) from a U-disk, without removing the part from the system and without the need for any external interface other than the USB.

AVR922: Adding a Serial Number to a USB Device
(file size: 120951, 6 pages, revision A, updated: 01/2009)

This application note describes how to add a unique serial number to a USB device (on top of VID and PID) with the help of the information stored in the embedded flash of a megaAVR with USB.

AVR928: Scalar sensorless methods to drive BLDC motors
(file size: 413101, 24 pages, revision A, updated: 05/2010)

This application note describes how to implement a sensorless commutation on BLDC motors and provides all information that is relevant for an implementation of sensorless commutation using the Atmel devices and Starter-kits.

AVR998: Guide to IEC60730 Class B compliance with AVR Microcontrollers
(file size: 111931, 9 pages, revision B, updated: 04/2008)

This application note describes the 'Class B' software classification, refering to embedded firmware which is intended to prevent unsafe operation of controlled equipment and provides guidelines for compliance with the 'Class B' classification as it relates to AVR devices.

Atmel AVR042: AVR Hardware Design Considerations
(file size: 241860, 16 pages, revision K, updated: 07/2011)

This application note has been written to provide answers to some of the questions and problems faced when starting designs involving Atmel® AVR® microcontrollers.

Atmel AVR154: Software Emulation of TWI Slave Hardware Module
(file size: 77KB, 4 pages, revision A, updated: 03/2012)

This application note describes a Two-wire Interface (TWI) slave implementation, in the form of a full-featured driver and an example of usage for this driver. Many chips feature a hardware TWI module; others have Universal Serial Interface (USI), which can be used in TWI mode. This application note discusses the TWI slave driver for devices without any of these hardware modules. This driver emulates the hardware TWI slave in software hence providing the programmer an easy way of porting the code from high end TWI enabled devices to low cost devices.

Atmel AVR156: TWI Master Bit Bang Driver
(file size: 126KB, 4 pages, revision A, updated: 07/2012)

This application note describes a Two-wire Interface (TWI) master implementation, in the form of a full-featured driver. Many chips feature a hardware TWI module; others have Universal Serial Interface (USI), which can be used in TWI mode. This application note discusses the TWI master driver for devices without any of these hardware modules. This driver provides interfaces to read/write to a TWI slave.

Atmel AVR260: TV Control Touch Keyboard
(file size: 946KB, 26 pages, revision A, updated: 03/2012)

This application note describes the TV Control Touch Keyboard, which is designed to be the drop-in replacement for an existing electromechanical (resistive ladder) type TV control keyboard. It is based on the latest capacitive touch technology for man-machine/user interface. Though designed for TV control application, can be used for any other application with 5~7 touch keys. The touch keyboard outputs respective analog (DC) output upon touching any key, based on the supply (VCC) voltage supplied externally.

Atmel AVR32848: Android Accessory Demo
(file size: 714KB, 11 pages, revision A, updated: 05/2012)

This document explains the usage of the demonstrator developed for the Android Open Accessory Protocol and based on Atmel microcontrollers. The examples are included in the Atmel Software Framework (ASF) to provide the customer with a quick and easy way to get started with developing an Android accessory. The use of the library is explained in the AVR4960 application note.

Atmel AVR4023: FLIP USB DFU Protocol
(file size: 143KB, 15 pages, revision A, updated: 03/2012)

This application note describes the FLIP USB DFU Protocol. To perform firmware upgrade, Atmel has developed a Flexible in-system programmer (FLIP). This software allows performing In-System Programming from an USB host controller without removing the part from the system or without a preprogrammed application, and without any external programming interface.

Atmel AVR4029: Atmel Software Framework - Getting Started
(file size: 797KB, 25 pages, revision C, updated: 03/2013)

The Atmel® Software Framework (ASF) is a collection of embedded software for Atmel flash MCU: megaAVR, AVR XMEGA, AVR UC3, and SAM devices.

Atmel AVR4030: AVR Software Framework - Reference Manual
(file size: 362KB, 28 pages, revision B, updated: 03/2012)

The Atmel® Software Framework (ASF) is a collection of embedded software for Atmel flash MCU: megaAVR, AVR XMEGA, AVR UC3, and SAM devices.

Atmel AVR4901: ASF - USB Vendor Class Application
(file size: 614KB, 20 pages, revision A, updated: 03/2012)

The aim of this application note is to provide an easy way to integrate a USB vendor class application on a new or existing project.

Atmel AVR4905: ASF - USB Device HID Generic
(file size: 559KB, 19 pages, revision A, updated: 03/2012)

The aim of this document is to provide an easy way to integrate a USB Device HID Generic application on a new or existing project.

Atmel AVR4950: ASF - USB Host Stack
(file size: 323KB, 24 pages, revision A, updated: 03/2012)

This document introduces the USB host stack. This stack is included in the Atmel® AVR Software Framework (ASF), and aims to provide the customer with the quickest and easiest way to build a USB embedded host application. Also this USB host stack is oriented low footprint and low power. A full description of this stack is available in this document.

Atmel AVR541: Migrating from AT90PWM81 to AT90PWM161
(file size: 99KB, 5 pages, revision B, updated: 08/2012)

This application note aims to outline the differences between Atmel AT90PWM81 and Atmel AT90PWM161.

AVR000: Register and Bit-Name Definitions for the 8-bit AVR Microcontroller
(file size: 129551, 2 pages, revision C, updated: 11/2009)

This Application Note contains files which allow the user to use Register and Bit names from the databook when writing assembly programs for 8-bit AVR microcontrollers.

AVR001: Conditional Assembly and portability macros
(file size: 95161, 6 pages, revision E, updated: 04/2008)

This application note describes the Conditional Assembly feature present in the 8-bit AVR Assembler version 1.74 and later. Examples of how to use Conditional Assembly are included to illustrate the syntax and concept.

AVR030: Getting Started with IAR Embedded Workbench for Atmel 8-bit AVR
(file size: 350457, 10 pages, revision D, updated: 10/2004)

The purpose of this application note is to guide new users through the initial settings of IAR Embedded Workbench, and compile a simple C-program.

AVR031: Getting Started with ImageCraft C for Atmel 8-bit AVR
(file size: 128488, 8 pages, revision B, updated: 05/2002)

The purpose of this Application Note is to guide new users through the initial settings of the ImageCraft IDE and compile a simple C program.

AVR032: Linker Command Files for the IAR ICCA90 Compiler
(file size: 137935, 11 pages, revision B, updated: 05/2002)

This Application Note describes how to make a linker command file for use with the IAR ICCA90 C-compiler for the 8-bit AVR Microcontroller.

AVR033: Getting Started with the CodeVisionAVR C Compiler
(file size: 2916, 18 pages, revision C, updated: 04/2008)

The purpose of this Application Note is to guide the user through the preparation of an example C program using the CodeVisionAVR C compiler.

AVR034: Mixing C and Assembly Code with IAR Embedded Workbench for 8-bit AVR microcontrollers
(file size: 96573, 8 pages, revision B, updated: 04/2003)

This Application Note describes how to use C to control the program flow among main program and assembly modules to control time critical I/O functions.

AVR035: Efficient C Coding for 8-bit AVR microcontrollers
(file size: 143596, 22 pages, revision D, updated: 01/2004)

This Application Note describes how to utilize the advantages of the 8-bit AVR architecture and the development tools to achieve more efficient c Code than for any other microcontroller.

AVR040: EMC Design Considerations
(file size: 107789, 18 pages, revision D, updated: 06/2006)

This Application Note covers the most common EMC problems designers encounter when using Microcontrollers.

AVR053: Calibration of the internal RC oscillator
(file size: 83199, 15 pages, revision G, updated: 05/2006)

This application note describes a method to calibrate the internal RC oscillator and targets all AVR devices with tunable RC oscillator. Furthermore, an easily adaptable calibration firmware source code is also offered.

AVR060: JTAG ICE Communication Protocol
(file size: 139206, 20 pages, revision B, updated: 01/2004)

This application note describes the communication protocol used between AVR Studio and JTAG ICE.

AVR061: STK500 Communication Protocol
(file size: 814798, 31 pages, revision B, updated: 04/2003)

This document describes the protocol for the STK500 starterkit. This protocol is based on earlier protocols made for other AVR tools and is fully compatible with them in that there should not be any overlapping or redefined commands.

AVR064: STK502 - A Temperature Monitoring System with LCD Output
(file size: 618368, 24 pages, revision C, updated: 02/2006)

This application note explains how to use the ATmega169(P) and STK502 to display a temperature measurement on an LCD.

AVR065: LCD Driver for the STK502
(file size: 148652, 17 pages, revision E, updated: 07/2008)

This application notes provides LCD drivers for the STK502 which is powered by Atmel powerful ATmega169(P).

AVR070: Modifying AT90ICEPRO and ATICE10 to Support Emulation of AT90S8535
(file size: 978868, 5 pages, revision C, updated: 05/2002)

Older AT90ICEPRO can be upgraded to support the new AVR devices with internal A/D converter. This Application Note describes in detail how to modify the AT90ICEPRO to support emulation of AT90S8535 and other AVR devices with A/D converter.

AVR072: Accessing 16-bit I/O Registers
(file size: 78147, 4 pages, revision B, updated: 05/2002)

This Application Note shows how to read and write the 16-bit registers in the AVR Microcontrollers. Since the AVR has an 8-bit I/O bus these registers must be written in two execution cycles. It explains how to safely read and write these 16-bit registers.

AVR074: Upgrading AT90ICEPRO to ICE10
(file size: 615370, 8 pages, revision B, updated: 05/2002)

This Application Note describes how to upgrade the AT90ICEPRO emulator to ATICE10 Version 2.0

AVR100: Accessing the EEPROM on tinyAVR and megaAVR devices
(file size: 66448, 7 pages, revision C, updated: 09/2005)

This Application Note contains assembly routines for accessing the EEPROM for all 8-bit AVR devices. Includes code for reading and writing EEPROM addresses sequentially and at random addresses.

AVR101: High Endurance EEPROM Storage
(file size: 48384, 5 pages, revision A, updated: 09/2002)

This Application Note describes how to make safe, high endurance, parameter storage in EEPROM, insuring no wear-out of the memory.

AVR102: Block Copy Routines on tinyAVR and megaAVR devices
(file size: 86605, 5 pages, revision B, updated: 05/2002)

This Application Note contains routines for transfer of data blocks on tinyAVR and megaAVR devices.

AVR104: Buffered Interrupt Controlled EEPROM Writes on tinyAVR and megaAVR devices
(file size: 79349, 9 pages, revision A, updated: 07/2003)

This application note presents a buffered interrupt driven approach to preserve and restore system information when power is turned off, significantly increasing general performance and decreasing power consumption compared to a polling implementation.

AVR105: Power efficient high endurance parameter storage in tinyAVR and megaAVR devices Flash memory
(file size: 148841, 10 pages, revision A, updated: 09/2003)

This application note describes how to implement a high endurance parameter storage method in Flash memory using the self-programming feature of the AVR.

AVR108: Setup and use of the LPM Instructions on tinyAVR and megaAVR devices
(file size: 77728, 4 pages, revision B, updated: 05/2002)

This Application Note describes how to access constants saved in Flash program memory of tinyAVR and megaAVR devices.

AVR109: Using Self Programming on tinyAVR and megaAVR devices
(file size: 94446, 11 pages, revision B, updated: 06/2004)

This Application note describes how an tinyAVR or megaAVR device with the SPM instruction can be configured for Self Programming.

AVR120: Characterization and Calibration of the ADC on an AVR
(file size: 143621, 15 pages, revision D, updated: 02/2006)

This application note explains various ADC (Analog to Digital Converter) characterization parameters, how they affect ADC measurements and how to measure them and how to perform run-time compensation.

AVR128: Using the Analog Comparator on tinyAVR and megaAVR devices
(file size: 74183, 4 pages, revision B, updated: 05/2002)

This Application Note serves as an example on how to set up and use the AVR's on-chip Analog Comparator.

AVR130: Using the timers on tinyAVR and megaAVR devices
(file size: 184089, 16 pages, revision A, updated: 02/2002)

This Application Note describes how to use the different timers on tinyAVR and megaAVR devices. The intention of this document is to give a general overview of the timers, show their possibilities and explain how to configure them.

AVR131: Using the 8-bit AVR High-speed PWM
(file size: 1492, 8 pages, revision A, updated: 09/2003)

This application note is an introduction to the use of the high-speed Pulse Width Modulator (PWM) available on some tinyAVR and megaAVR devices.

AVR132: Using the Enhanced Watchdog Timer on tinyAVR and megaAVR devices
(file size: 142906, 17 pages, revision C, updated: 06/2008)

This Application Note describes how to utilize the Enhanced Watchdog Timer (WDT) used on new 8-bit AVR devices. In addition to performing System Reset, the WDT now also has the ability to generate an interrupt.

AVR133: Long Delay Generation Using the 8-bit AVR Microcontroller
(file size: 232417, 8 pages, revision B, updated: 01/2004)

The solution presented here shows how the AVR AT90 series microcontrollers generate and handle long delays, without any software intervention, thus allowing the core to be in a low-power mode during the delay.

AVR134: Real-Time Clock using the Asynchronous Timer on tinyAVR and megaAVR devices
(file size: 68530, 9 pages, revision G, updated: 04/2009)

This Application Note describes how to implement a real-time (RTC) on tinyAVR and megaAVR devices that features the RTC module.

AVR180: External Brown-Out Protection
(file size: 201943, 16 pages, revision B, updated: 05/2002)

This Application Note shows in detail how to prevent system malfunction during periods of insufficient power supply voltage.

AVR182: Zero Cross Detector on tinyAVR and megaAVR devices
(file size: 97422, 8 pages, revision B, updated: 01/2004)

This Application Note describes how to implement an efficient zero cross detector for mains power lines using an tinyAVR and megaAVR devices

AVR200: Multiply and Divide Routines
(file size: 231576, 21 pages, revision D, updated: 05/2006)

This Application Note lists subroutines for multiplication and division of 8 and 16-bit signed and unsigned numbers.

AVR201: Using the 8-bit AVR Hardware Multiplier
(file size: 115292, 11 pages, revision C, updated: 06/2002)

Examples of using the 8-bit AVR multiplier for 8-bit arithmetic.

AVR202: 16-Bit Arithmetics on tinyAVR and megaAVR devices
(file size: 71145, 3 pages, revision B, updated: 05/2002)

This Application Note lists program examples for arithmetic operation on 16-bit values on tinyAVR and megaAVR devices.

AVR204: BCD Arithmetics
(file size: 96638, 14 pages, revision B, updated: 01/2003)

This Application Note lists routines for BCD arithmetics.

AVR220: Bubble Sort
(file size: 94201, 5 pages, revision B, updated: 05/2002)

This Application Note implements the Bubble Sort algorithm on the AVR controllers.

AVR222: 8-Point Moving Average Filter on tinyAVR and megaAVR devices
(file size: 86818, 5 pages, revision B, updated: 05/2002)

This Application Note gives an demonstration of how the addressing modes in the tinyAVR and megaAVR architecture can be utlized.

AVR223: Digital Filters on tinyAVR and megaAVR devices
(file size: 23613, 18 pages, revision B, updated: 07/2008)

This application note explains how to implement digital filters on Atmel® tinyAVR®, and Atmel® megaAVR® devices, taking into consideration coefficient and data scaling and methods of optimization.

AVR230: DES Bootloader on tinyAVR and megaAVR devices
(file size: 1910487, 24 pages, revision D, updated: 04/2005)

This application note describes how firmware can be updated securely on microcontrollers with bootloader capabilities, using the Data Encryption Standard (DES) or triple DES to encrypt the firmware.

AVR236: CRC check of Program Memory on tinyAVR and megaAVR devices with LPM instruction
(file size: 117934, 9 pages, revision B, updated: 05/2002)

The Application Note describes CRC (Cyclic Redundancy Check) theory and implementation of CRC checking of program memory for secure applications.

AVR240: 4x4 Keypad-Wake Up on Keypress on tinyAVR and megaAVR devices
(file size: 77028, 14 pages, revision D, updated: 06/2006)

This Application Note describes a simple interface to a 4 x 4 keypad designed for low power battery operation.

AVR242: Multiplexing LED Drive & a 4x4 Keypad on tinyAVR and megaAVR devices
(file size: 151033, 26 pages, revision B, updated: 05/2002)

This Application Note describes a comprehensive system providing a 4 x 4 keypad as input into a real time clock/timer with two outputs and controls external loads and a four digit mulitplexed LED display.

AVR243: Matrix Keyboard Decoder on tinyAVR and megaAVR devices
(file size: 107554, 11 pages, revision A, updated: 01/2003)

This application note describes a software driver interfacing an 8x8 keyboard and is designed for low power battery operation. The application also supports user-defined alternation keys to implement Caps Lock, Ctrl-, Shift- and Alt-like functionality.

AVR244: UART as ANSI Terminal Interface
(file size: 56579, 8 pages, revision A, updated: 11/2003)

This application note describes some basic routines to interface an AVR microcontroller to a terminal window using the UART (hardware or software).

AVR301: 8-bit AVR C Code for Interfacing AVR to AT17CXXX FPGA Configuration Memories
(file size: 103351, 20 pages, revision D, updated: 01/2004)

This Application Note describes how to In-System-Program (ISP) an Atmel FPGA Configuration Memory using an 8-bit AVR MCU and how to bit bang TWI using port pins on an AT90S8515 AVR MCU

AVR304: Half Duplex Interrupt Driven Software UART on tinyAVR and megaAVR devices
(file size: 64253, 8 pages, revision C, updated: 04/2008)

This Application Note describes how to make a half duplex UART on any tinyAVR or megaAVR device using the 8-bit Timer/Counter0 and an external interrupt.

AVR305: Half Duplex Compact Software UART on tinyAVR and megaAVR devices
(file size: 75005, 9 pages, revision C, updated: 09/2005)

This Application Note describes how to implement a polled software UART capable of handling speeds up to 614,400 bps on an AT90S1200.

AVR306: Using the AVR UART in C on tinyAVR and megaAVR devices
(file size: 51913, 3 pages, revision B, updated: 07/2002)

This Application Note describes how to set up and use the UART present in most 8-bit AVR devices. C code examples are included for polled and interrupt controlled UART applications

AVR307: Half Duplex UART Using the USI Module on tinyAVR and megaAVR devices
(file size: 8242, 18 pages, revision A, updated: 10/2003)

The Universal Serial Interface (USI) present in 8-bit AVR devices like the ATtiny26, ATtiny2313, and ATmega169, is a communication module designed for TWI and SPI communication, but can also be used for UART communication as well.

AVR308: Software LIN Slave on tinyAVR and megaAVR devices
(file size: 143208, 12 pages, revision B, updated: 05/2002)

This Application Note shows how to implement a LIN (Local Interconnect Network) slave task on tinyAVR and megaAVR devices without the need for any external components.

AVR313: Interfacing a PC AT Keyboard on tinyAVR and megaAVR devices
(file size: 154182, 13 pages, revision B, updated: 05/2002)

Most microcontrollers requires some kind of human interface. This Application Note describes one way of doing this using a standard PC AT Keyboard.

AVR314: DTMF Generator on tinyAVR and megaAVR devices
(file size: 113780, 8 pages, revision B, updated: 05/2002)

This Application Note describes how DTMF (Dual-Tone Multiple Frequencies) signaling can be implemented using any tinyAVR or megaAVR device with PWM and SRAM.

AVR320: Software SPI Master
(file size: 58758, 5 pages, revision C, updated: 09/2005)

This Application Note describes a set of low-level routines for software implementation of the SPI (Synchronous Peripheral Interface). These can be used for communicating with Atmel's 25xxx family of Serial EEPROM memories.

AVR325: High-Speed Interface to Host Enhanced Parallel Port (EPP) using tinyAVR and megaAVR devices
(file size: 73938, 7 pages, revision A, updated: 02/2002)

This Application Note describes a method for high-speed bidirectional data transfer between an AVR Microcontroller and an of-the-shelf IBM (R) PC-compatible desktop computer, using its Enhanced Parallel Port (EPP) 8-bit parallel data path.

AVR335: Digital Sound Recorder with tinyAVR or megaAVR and DataFlash
(file size: 152873, 20 pages, revision C, updated: 04/2005)

This Application Note describes how to record, store and play back sound using any 8-bit AVR MCU with A/D converter, the AT45DB161 DataFlash memory and a few extra components

AVR350: Xmodem CRC Receive Utility for tinyAVR and megaAVR devices
(file size: 111430, 7 pages, revision D, updated: 01/2008)

The Xmodem protocol was created years ago as a simple means of having two computers talk to each other and has found its way into many applications.

AVR360: Step Motor Controller using tinyAVR and megaAVR devices
(file size: 73457, 4 pages, revision B, updated: 04/2003)

Discontinued

AVR400: Low Cost A/D Converter using Analog Comp. on tinyAVR and megaAVR devices
(file size: 101749, 6 pages, revision B, updated: 05/2002)

This Application Note targets cost and space critical applications that need an ADC and explains how to use an analog comparator for this purpose.

AVR401: 8-Bit Precision A/D Converter using Analog Comp. on tinyAVR and megaAVR devices
(file size: 88004, 12 pages, revision C, updated: 02/2003)

This Application Note describes how to perform a kind of dual slope A/D conversion with the analog comparator of tinyAVR and megaAVR devices

AVR410: RC5 IR Remote Control Receiver on tinyAVR and megaAVR devices
(file size: 171728, 10 pages, revision B, updated: 05/2002)

This Application Note describes a receiver for the frequently used Philips/Sony RC5 coding scheme

AVR415: RC5 IR Remote Control Transmitter on tinyAVR and megaAVR devices
(file size: 84070, 5 pages, revision A, updated: 05/2003)

In this application note the widely used RC5 coding scheme from Philips will be described and a fully working remote control solution will be presented. This application will use the ATtiny28 AVR microcontroller for this purpose.

AVR460: Embedded Web Server on megaAVR devices
(file size: 666599, 53 pages, revision C, updated: 05/2002)

This application note explains how embedded applications can be connected directly to the internet.

AVR461: Quick Start Guide for the Embedded Internet Toolkit
(file size: 804915, 16 pages, revision B, updated: 05/2002)

This Quick Start Guide gives an introduction to using the AVR Embedded Internet Toolkit and can be used as a guide for getting started with embedded internet applications.

AVR462: Reducing the Power Consumption of AT90EIT1
(file size: 367271, 3 pages, revision A, updated: 03/2002)

This Application Note describes a small modification to the AVR Embedded Internet Toolkit. This will reduce the power consumption and the operating temperature of the board.

AVR603 : STK200 Modification from Rev. B to Rev C
(updated: 01/1900)

This document describes how to modify the STK200 from rev B to rev C.

AVR604: Understanding the AVR ICEPRO I/O Registers
(9 pages, revision A, updated: 04/1998)

This Application Note describes the I/O Register views seen in AVR Studio when using the ICEPRO emulator.

AVR910: In-System Programming
(file size: 224606, 12 pages, revision E, updated: 08/2008)

This Application Note shows how to design an application to support in-system programming.

Computers that You Wear Help Your Work and Play
(file size: 112KB, 4 pages, updated: 05/2013)

Designing Feature-Rich User Interfaces for Home and Industrial Controllers
(file size: 933KB, 5 pages, updated: 06/2013)

Microprocessor or Microcontroller
(file size: 104KB, 4 pages, updated: 05/2013)

8-bit Microcontroller Drives Battery-powered Thermostat
(file size: 294135, 2 pages, updated: 01/2004)

Algorithm Builder for AVR
(file size: 193382, 2 pages, updated: 01/2004)

Atmel AVR-based Constant Current Supply
(file size: 440689, 4 pages, updated: 01/2004)

Heterogeneous Device Networking
(file size: 201238, 2 pages, updated: 01/2004)

High-level Tool Targeted for AVR Controllers
(file size: 219090, 2 pages, updated: 01/2004)

Automotive Solutions
(file size: 459 KB, 20 pages, revision K, updated: 02/2013)

Atmel AVR Xplained - Evaluate the AVR
(2 pages, revision C)

Atmel megaAVR - High Performance, Low Power
(revision H)

Atmel Xplained Pro
(file size: 40K, 2 pages, revision B, updated: 02/2013)

Atmel Xplained Pro kits provide a complete and easy to use low-cost development platform for evaluating and prototyping your Atmel Flash-based microcontrollers (MCUs) designs.

Atmel AVR Microntrollers
(2 pages, updated: 01/2013)

Atmel AVR Studio 5 - development and debugging
(2 pages, updated: 01/2013)

Atmel Studio - Software Development Environment
(2 pages, revision B, updated: 09/2012)

AVR Instruction Set
(file size: 1276689, 160 pages, revision I, updated: 07/2010)

AVR and AVR32 - Quick Reference Guide
(file size: 10252806, 68 pages, revision I, updated: 05/2009)

Introduction of the product range of AVR and AVR32 microcontrollers and application processors:

• Device family description
• Key features
• Device selection guides
• Application oriented device families
• Tools offer

Next-Generation IDE: Maximizing IP Reuse
(file size: 988KB, 15 pages, updated: 07/2012)