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AT91SAM7X256 32位ARM单片机

Status	Production
Flash (Bytes)	256K
SRAM (Bytes)	64K
Ethernet MAC 10/100	1
RTC/RTT	-/1
10-bit ADC Channels	8
Peripheral DMA Channels	11
Max. Clock Speed (MHz)	55
I/O Pins	62
SDRAM Interface	1
Enhanced USART	2
USART/DBGU	-/1
SPI	2
TWI	1
SSC	1
USB Device	FS
PWM Controller	4
High Current Pads	4
16-bit Timers	3
Period Interval Timer	1
Watchdog Timer	1
Power-On-Reset	1
Brown Out Detection	1
On-chip RC Oscillator	1
Crystal Oscillator/PLL	1/1
ARM Core	7TDMI
CAN	1
I/O Voltage Domain (V)	3.3
In-System Programming	Y
Single Supply	Y
Pb-Free Packages	LQFP 100 TFBGA 100

AT91SAM7X256 描述

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.

• 512KB 系统内可编程Flash存储器: AT91SAM7X512
• 256KB 系统内可编程Flash存储器: AT91SAM7X256
• 128KB 系统内可编程Flash存储器: AT91SAM7X128

AT91SAM7X256 特性

• Incorporates the ARM7TDMI® ARM® Thumb® Processor
  – High-performance 32-bit RISC Architecture
  – High-density 16-bit Instruction Set
• Leader in MIPS/Watt
  – EmbeddedICE™ In-circuit Emulation, Debug Communication Channel Support
• Internal High-speed Flash
  – 512 Kbytes (AT91SAM7X512) Organized in Two Banks of 1024 Pages of
  256 Bytes (Dual Plane)
  – 256 Kbytes (AT91SAM7X256) Organized in 1024 Pages of 256 Bytes (Single Plane)
  – 128 Kbytes (AT91SAM7X128) Organized in 512 Pages of 256 Bytes (Single Plane)
• Single Cycle Access at Up to 30 MHz in Worst Case Conditions
• Prefetch Buffer Optimizing Thumb Instruction Execution at Maximum Speed
• Page Programming Time: 6 ms, Including Page Auto-erase,
  Full Erase Time: 15 ms
• 10,000 Write Cycles, 10-year Data Retention Capability,
  Sector Lock Capabilities, Flash Security Bit
• Fast Flash Programming Interface for High Volume Production
• Internal High-speed SRAM, Single-cycle Access at Maximum Speed
  – 128 Kbytes (AT91SAM7X512)
  – 64 Kbytes (AT91SAM7X256)
  – 32 Kbytes (AT91SAM7X128)
• Memory Controller (MC)
  – Embedded Flash Controller, Abort Status and Misalignment Detection
• Reset Controller (RSTC)
  – Based on Power-on Reset Cells and Low-power Factory-calibrated Brownout
  Detector
  – Provides External Reset Signal Shaping and Reset Source Status
• Clock Generator (CKGR)
  – Low-power RC Oscillator, 3 to 20 MHz On-chip Oscillator and one PLL
• Power Management Controller (PMC)
  – Power Optimization Capabilities, Including Slow Clock Mode (Down to 500 Hz) and
  Idle Mode
  – Four Programmable External Clock Signals
• Advanced Interrupt Controller (AIC)
  – Individually Maskable, Eight-level Priority, Vectored Interrupt Sources
  – Two External Interrupt Sources and One Fast Interrupt Source, Spurious Interrupt
  Protected
• Debug Unit (DBGU)
  – 2-wire UART and Support for Debug Communication Channel interrupt,
  Programmable ICE Access Prevention
• Periodic Interval Timer (PIT)
  – 20-bit Programmable Counter plus 12-bit Interval Counter
• Windowed Watchdog (WDT)
  – 12-bit key-protected Programmable Counter
  – Provides Reset or Interrupt Signals to the System
  – Counter May Be Stopped While the Processor is in Debug State or in Idle Mode
• Real-time Timer (RTT)
  32-bit Free-running Counter with Alarm
  Runs Off the Internal RC Oscillator
• Two Parallel Input/Output Controllers (PIO)
  Sixty-two Programmable I/O Lines Multiplexed with up to Two Peripheral I/Os
  Input Change Interrupt Capability on Each I/O Line
  Individually Programmable Open-drain, Pull-up Resistor and Synchronous Output
• Thirteen Peripheral DMA Controller (PDC) Channels
• One USB 2.0 Full Speed (12 Mbits per second) Device Port
  On-chip Transceiver, 1352-byte Configurable Integrated FIFOs
• One Ethernet MAC 10/100 base-T
  Media Independent Interface (MII) or Reduced Media Independent Interface (RMII)
  Integrated 28-byte FIFOs and Dedicated DMA Channels for Transmit and Receive
• One Part 2.0A and Part 2.0B Compliant CAN Controller
  Eight Fully-programmable Message Object Mailboxes, 16-bit Time Stamp Counter
• One Synchronous Serial Controller (SSC)
  Independent Clock and Frame Sync Signals for Each Receiver and Transmitter
  I²S Analog Interface Support, Time Division Multiplex Support
  High-speed Continuous Data Stream Capabilities with 32-bit Data Transfer
• Two Universal Synchronous/Asynchronous Receiver Transmitters (USART)
  Individual Baud Rate Generator, IrDAInfrared Modulation/Demodulation
  Support for ISO7816 T0/T1 Smart Card, Hardware Handshaking, RS485 Support
  Full Modem Line Support on USART1
• Two Master/Slave Serial Peripheral Interfaces (SPI)
  8- to 16-bit Programmable Data Length, Four External Peripheral Chip Selects
• One Three-channel 16-bit Timer/Counter (TC)
  Three External Clock Inputs, Two Multi-purpose I/O Pins per Channel
  Double PWM Generation, Capture/Waveform Mode, Up/Down Capability
• One Four-channel 16-bit Power Width Modulation Controller (PWMC)
• One Two-wire Interface (TWI)
  Master Mode Support Only, All Two-wire Atmel EEPROMs and I2C Compatible Devices Supported
• One 8-channel 10-bit Analog-to-Digital Converter, Four Channels Multiplexed with Digital I/Os
• SAM-BABoot Assistance
  Default Boot program
  Interface with SAM-BA Graphic User Interface
• IEEE1149.1 JTAG Boundary Scan on All Digital Pins
• 5V-tolerant I/Os, Including Four High-current Drive I/O lines, Up to 16 mA Each
• Power Supplies
  Embedded 1.8V Regulator, Drawing up to 100 mA for the Core and External Components
  3.3V VDDIO I/O Lines Power Supply, Independent 3.3V VDDFLASH Flash Power Supply
  1.8V VDDCORE Core Power Supply with Brownout Detector
• Fully Static Operation: Up to 55 MHz at 1.65V and 85°C Worst Case Conditions
• Available in 100-lead LQFP Green and 100-ball TFBGA Green Packages

AT91SAM7X256 订购型号

Ordering Code	Package	Package Type	Operating Temperature Range
AT91SAM7X256-AU	LQFP 100	Green	Industrial (-40° C to 85° C)
AT91SAM7X256-CU	TFBGA 100	Green	Industrial (-40° C to 85° C)
AT91SAM7X256B-AU	LQFP 100	Green	Industrial (-40° C to 85° C)
AT91SAM7X256B-CU	TFBGA 100	Green	Industrial (-40° C to 85° C)

AT91SAM7X256 应用技术支持与电子电路设计开发资源下载

1. AT91SAM7X256 数据手册DataSheet 下载. PDF（简洁版）
2. AT91SAM7X256 数据手册DataSheet 下载. PDF（完整版）
3. ARM7TDMI 技术白皮书
4. AT91SAM 系列产品选型指南(Brochure, 2 pages, revision E, updated 2/09)
   Product selection guide to Atmel's AT91SAM microcontrollers that give immediate access to market-leading ARM processors.
5. 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.