| AT91SAM7X256 |
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| The AT91SAM7X256 is a Flash microcontroller with integrated Ethernet, USB and CAN interface, based on the 32-bit ARM7TDMI RISC processor. It features 256K bytes of embedded high-speed Flash with sector lock capabilities and a security bit, and 64K 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, Ethernet MAC 10/100 base T, CAN 2.0A and 2.0B compliant Controller, 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 AT91SAM7X256 is supplied in a 100-lead LQFP Green package. It is supported by an Evaluation Board and extensive application development tools.
The AT91SAM7X256 is a general-purpose microcontroller, particularly suited to real-time embedded control applications that require USB connectivity as well as Ethernet, CAN and/or ZigBee networking.
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Production |
| Ethernet MAC 10/100 |
1 |
| Flash (Bytes) |
256K |
| SRAM (Bytes) |
64K |
| CAN |
1 |
| RTC/RTT |
-/1 |
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LQFP 100
TFBGA 100
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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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AT91SAM7X Series Preliminary Summary
(45 pages, revision FS, updated 2/09)
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AT91SAM7X Series Preliminary
(687 pages, revision H, updated 2/09)
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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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Using the Serial Peripheral Interface with AT91SAMxx Devices
(11 pages, revision B, updated 8/06)
Describes initializaton of the SPI, main SPI features are summarized and characteristics that may be difficult to use are detailed. A software example of an interconnection between two SPIs is also described.
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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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AT91SAM7X-EK
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Programmer:
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AT91 In-system Programmer (ISP)
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AT91SAM CAN Bootloader
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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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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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SAM7X256_LQFP100_BSD
Boundary scan description file (BSD). |
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SAM7X256_LQFP100_IBIS
I/O Buffer specification (IBIS) model. |
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SAM7X256_TFBGA100_BSD
Boundary scan description file (BSD). |
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SAM7X256_TFBGA100_IBIS
I/O Buffer specification (IBIS) model. |
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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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AT91SAM7X and AT91SAM7XC ARM Microcontrollers
(Flyer, 2 pages, revision B, updated 04/07)
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Data Converter Terminology
(Other, 22 pages, revision C, updated 1/10)
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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Touch Solutions
