| AT91SAM7S128 |
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| The AT91SAM7S128 is a low pincount Flash microcontroller based on the 32-bit ARM7TDMI RISC processor. It features 128K bytes of embedded high-speed Flash with sector lock capabilities and a security bit, and 32K bytes of SRAM. The integrated proprietary SAM-BA Boot Assistant enables in-system programming of the embedded Flash.
Its extensive peripheral set includes a USB 2.0 Full Speed Device Port, USARTs, SPI, SSC, TWI and an 8-channel 10-bit ADC. Its Peripheral DMA Controller channels eliminate processor bottlenecks during peripheral-to-memory transfers. Its System Controller manages interrupts, clocks, power, time, debug and reset, significantly reducing the external chip count and minimizing power consumption.
In industrial temperature, worse case conditions the maximum clock frequency is 55MHz. Typical core supply is 1.8V, I/Os are supplied at 1.8V or 3.3V and are 5V tolerant. An integrated Voltage Regulator permits single supply at 3.3V. The AT91SAM7S128 is supplied in a 64-lead LQFP or QFN Green package. It is supported by an Evaluation Board and extensive application development tools.
The AT91SAM7S128 is a general-purpose microcontroller, providing an ideal migration path for 8-bit applications requiring additional performance, USB connectivity and extended memory.
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| Status |
Production |
| Flash (Bytes) |
128K |
| SRAM (Bytes) |
32K |
| Image Sensor Interface |
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| RTC/RTT |
-/1 |
| 10-bit ADC Channels |
8 |
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LQFP 64
QFN 64
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More |
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|  Check Distributor Inventory |
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ARM7TDMI Technical Reference Manual
(284 pages, updated 04/01)
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AT91SAM7S Series Preliminary Summary
(50 pages, revision GS, updated 11/07)
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AT91SAM7S Series Preliminary
(757 pages, revision I, updated 12/08)
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AT91 Assembler Code Startup Sequence for C Code Applications Software Based on the AT91SAM7S64 Evalu
(11 pages, revision A, updated 3/05)
This Application Note describes an example of the AT91SAM7S C-startup sequence based on the C-startup sequence for the AT91SAM7S64 Evaluation Board working with the IAR 4.11A Development Tools.
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AT91-AN01: Using the Two-wire interface (TWI) in Master Mode on AT91SAM Microcontrollers
(32 pages, revision B, updated 08/07)
This application note is an aid for developers in the
design of a system using the Two-wire Interface (TWI) of Atmel's AT91SAM family of microcontroller products with Atmel's Two-wire Interface slave devices and I2C-Bus compatible slave devices.
It describes the connection with a digital temperature sensor (LM75), a Real Time Clock (DS1337), a Graphic LCD Module(PCF8558) and a 1Mbit Two-wire Serial EEPROM (AT24C1024).
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AT91SAM Internet Radio
(41 pages, revision A, updated 05/07)
Describes an Internet Radio software that can run either on SAM9260-EK
or SAM7X-EK evaluation board. Includes a description of an add-on board
which contains a stereo audio codec, an LCD display and three push buttons.
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AT91SAM7S64 USB Certification
(34 pages, revision A, updated 02/06)
This Application Note describes the USB certification process for the AT91SAM7S64 microcontroller that contains a USB V2.0 Full Speed Device. It describes the full USB peripheral environment required for USB-IF compliancy.
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Connecting an Atmel ARM-based Serial Synchronous Controller to an I2S-compatible Serial Bus
(13 pages, revision A, updated 11/03)
Describes the configuration required to connect the Atmel ARM-based SSC to a device with an I2S-compatible serial bus.
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Interfacing a 4x4 Keyboard to an AT91 Microcontroller
(13 pages, revision A, updated 01/03)
This application note provides programming techniques used on the AT91 ARM-based microcontroller for scanning a 4 x 4 Keyboard matrix.
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 Other Related Application Notes |
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Application Software:
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AT91 Software Package
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Design Software:
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AT91 USB Framework
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Emulator:
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AT91SAM-ICE JTAG Emulator
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Evaluation Kit:
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AT91SAM7S-EK
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In-System Programming:
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AT91 In-system Programmer (ISP)
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Software Files:
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AT91SAM_pll.html
PLL MUL and DIV Calculator vs. the input and targeted output frequency. This tool provides the user with the best ratio between the MUL and DIV fields in order to obtain the the targeted PLL output frequency. If this frequency cannot be achieved exactly, this tool will provide the frequency
error in %.
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AT91SAM_usart_utility.html
Javascript file to help the user in USART field definition of the US_BRGR Register (Baud Rate Generator). |
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AT91SAM7S128_IBIS_2.1
I/O Buffer Specification (IBIS) models for the AT91SAM7S128. |
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AT91SAM7S128_TQ64_bsd.zip
AT91SAM7S128_TQ64_bsd.zip Boundary-Scan Description file (BSD) for the AT91SAM7S128 in LQFP 64 package. |
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ATMEL_PLL_LFT_Filter_CALCULATOR_AT91_2v9.zip
Excel spreadsheet allowing calculation of the best R-C-C component values on the PLL Loop Back Filter.
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AT91 Software Package |
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AT91 USB Framework |
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See more FAQs |
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AT91SAM Product Guide
(Brochure, 2 pages, revision F, updated 5/09)
Product selection guide to Atmel's AT91SAM microcontrollers that give immediate access to market-leading ARM processors. |
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AT91SAM7S-EK Evaluation Board User Guide
(User Guide, 27 pages, revision C, updated 02/07)
The AT91SAM7S-EK evaluation board enables the evaluation of and code development for applications running on an AT91SAM7Sxx device. |
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Atmel's ARM-based Flash Microcontrollers Optimized for Real-Time Control Applications
(Article, 2 pages, updated 02/05)
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Atmel's ARM-based Microcontroller Excels in Real-Time
(White Paper, 6 pages, revision A, updated 3/01)
Applications such as mobile communicators, PDAs, solid-state music players and internet appliances demand the best possible real-time performance. Atmel's AT91 series of ARM-based microcontrollers incorporates a number of advanced features that enhance the real-time performance of the ARM7TDMI core, making it ideal for applications of this nature. |
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Data Converter Terminology
(Other, 22 pages, revision B, updated 12/07)
This Application Note defines a number of key parameters related to data converters (ADC and DAC) and discusses the extent to which they can be tested. Equations are given to evaluate all key values. |
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Facilitating the Migration from 8-bit to 32-bit Microcontrollers
(White Paper, 8 pages, revision A, updated 10/04)
The continuous increase in functionality integrated in products is raising the performance
requirements and the program complexity of the microcontrollers. Barriers to higher performance
microcontrollers have been the unit cost and the cost of migration. Unit cost is not only related to
advanced manufacturing technologies reducing the cost impact for the extra processor
bandwidth, but also a function of system integration. The cost to port the existing code to a new
generation of higher performance microcontrollers cannot be eliminated but the transition can be
facilitated in order to reduce the total effort required. This paper describes how Atmel’s Smart
ARM 32-bit RISC Microcontrollers address these points. |
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