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Atmel AVR

Performance, Efficiency and Flexibility Advantage Like No Other

With ease-of-use, low power consumption, and a high level of integration in mind, Atmel® AVR® 8- and 32-bit microcontrollers complement the Atmel | SMART line of ARM®-based microcontrollers and microprocessors to deliver a unique combination of performance, power efficiency and design flexibility. Optimized to speed time-to-market, they are based on the industry's most code-efficient architecture for C and assembly programming. No other microcontroller delivers more computing performance with better power efficiency. Industry-leading development tools and design support let you get to market faster. Once there, the large AVR family lets you reuse your knowledge when improving your products and expanding to new markets—easily and cost-effectively.


Device Family Summary Benefit Applications Technologies Key Parameters
The world's most efficient 32-bit microcontroller
General Purpose




Event System

Self Programming
16-512KB Flash

48-144 pins

Up to 66 MHz

1.5 MIPS/MHz
Xtreme performance 8-bit
General Purpose



Event System


Self Programming
16-384KB Flash

32-100 pins

Up to 32 MHz

1.0 MIPS/MHz
More peripherals and options
General Purpose







Self Programming

4-256KB Flash


Up to 20 MHz

1.0 MIPS/MHz
Small and powerful
General Purpose

Limited board space



0.7V operation

0.5 – 8KB Flash

6-32 pins

Up to 20MHz

1.0 MIPS/MHz
Li-Ion Battery Management
Gas gauging

Cell balancing


Short-circuit protection

Heat protection

1 – 4 cells

High side N-MOS

Coloumb counter

Temperature sensor


1.8 – 25V operation

8 – 40KB Flash

28 – 48 pins

Up to 8 MHz

1.0 MIPS/MHz
Intelligence, control, and rugged design for demanding automotive environments.

Qualified for Automotive






Robust design for automotive environments

Rich portfolio for a variety of applications

Dependable design

The Performance, Features, and Tools You Need to Succeed Maximizing Power Efficiency
To meet the tough requirements of today's applications, Atmel has built upon more than a decade of low-power research to develop Atmel picoPower technology. AVR microcontrollers use picoPower to reduce power consumption in both sleep and active mode, and to achieve the industry's lowest power consumption, with 500nA @ 1.8V with the RTC (real-time-clock) running and 9 nA in power-down sleep mode.

A Complete Set of Tools to Streamline Development
Atmel offers a high quality, easy-to-use tool chain for the full range of AVR families. Available for free, the Atmel Studio integrated development environment enables code development in C or assembly, simulation, and integrates seamlessly with Atmel starter kits, programmers, debuggers, evaluation kits, and reference designs. The result is faster development, a more productive development team, and rapid time-to-market.

Atmel AVR Tools Quality

Software Made Easy
Atmel offers The Atmel Software Framework (ASF), a complete library of drivers and middleware needed to build an application. A common Application Protocol Interface (API) is provided making it easy to port your software between different AVR microcontrollers. The Atmel Gallery has a range of examples and videos on development. Atmel Spaces offers a collaborative work environment where you can have a team spread across the world working on the same project. In addition, a large collection of application notes explains how to use all on-chip peripherals in an application.

In addition, a large collection of application notes explains how to use all on-chip peripherals in an application.

Capacitive Touch
Atmel QTouch® Library makes it simple for developers to embed capacitive-touch button, slider, and wheel (BSW) functionality into general-purpose AVR microcontroller applications. The royalty-free QTouch Library provides several library files for each device and supports different numbers of touch channels, enabling both flexibility and efficiency in touch applications. By selecting the library file supporting the exact number of channels needed, developers can achieve a more compact and efficient code using less RAM.

A Perfect Fit for Your Application
Atmel compliments its broad range of standard AVR microcontrollers with a growing portfolio of derivatives tailored to specific applications. Our expanding portfolio enables you to support a wide range of applications and functions, including automotive, LCD drivers, CAN networking, USB connectivity, motor control, lighting applications, single-chip battery management, IEEE 802.15.4, ZigBee, Remote Access Control, and more.

Removing Data Transfer Bottlenecks
The DMA controller found in Atmel AVR XMEGA and Atmel AVR UC3 sets a new standard for data transfer efficiency in microcontrollers. It allows efficient data transfers between peripherals and memories with minimal CPU intervention. The result is data transfer rates of up to 33MBit/s over each SPI and USART port— with only a 15% load on the CPU.

Peripheral Intelligence
Atmel SleepWalking technology in AVR XMEGA, AVR UC3, and Atmel megaAVR devices adds intelligence to peripherals, enabling them to perform a basic range check before they generate an interrupt to the CPU. Combined with power saving modes, the automatic range check can be applied to remove the need to wake up the CPU at regular intervals to check the environment. The intelligent peripherals will monitor the environment on their own, and only wake the CPU when there is a need for action. Because the CPU draws far more energy than a single peripheral, SleepWalking can dramatically reduce power consumption.

Peripheral Cooperation
Inefficient peripheral management can reduce performance and increase power consumption. To overcome these problems, our Peripheral Event System lets peripherals send signals (events) directly to other peripherals, bypassing the CPU. The result is short, predictable response times, a reduced number of wakeups from sleep, and CPU resources freed up for other tasks. The Peripheral Event System can also replace interrupt-driven data transfer with event-triggered data transfer, to help reduce application power consumption and increase system performance.

Advanced Arithmetic Performance
For applications that demand high-end arithmetic performance, selected AVR microcontrollers feature an IEEE 754-compliant Floating Point Unit (FPU). This integrated component lets the microcontrollers perform arithmetic calculations on decimal numbers in fewer clock cycles, with higher precision. The FPU helps enhance a wide range of applications. You can filter or analyze sensor data to suppress noise and capture better quality information, and process audio data without loss of fidelity.

Integrated Security
To help safeguard sensitive information, some AVR microcontrollers include a high-performance encryption and decryption engine that supports 128-, 192- and 256-bit key lengths for AES and 56-bit key lengths for DES. These products are ideal for applications that require on-the-fly encryption of high-speed communication streams.

Flash Security
To safeguard sensitive data, Atmel FlashVault code protection enables on-chip flash memory to be partially programmed and locked, for secure on-chip storage of software intellectual property. FlashVault code protection can carry software such as a math library or an encryption algorithm to potentially untrustworthy environments where the rest of the source code can be developed and debugged. All AVR microcontrollers contain lock mechanisms to prevent reading and copying the program stored in on-chip flash memory.

The Power of Self-Programming Flash Memory
For flexibility and scalability, support for self-programming flash memory enables field upgrades via any communication interface. It also lets customers perform encrypted field programming, reducing or completely eliminating risk of programming the wrong binary. Read-while-Write flash memory support lets customers continue to run applications while an upgrade is in progress, to minimize downtime.