Features

• Incorporates the ARM7TDMI? ARM? Thumb? Processor
  – High-performance 32-bit RISC Architecture
  – High-density 16-bit Instruction Set
  – Leader in MIPS/Watt
  – Embedded*ICE¢â In-circuit Emulation, Debug Communication Channel Support
• Internal High-speed Flash
  – 256 kbytes, organized in 1024 Pages of 256 Bytes (AT91SAM7S256)
  – 128 kbytes, organized in 512 Pages of 256 Bytes (AT91SAM7S128)
  – 64 kbytes, organized in 512 Pages of 128 Bytes (AT91SAM7S64)
  – 32 kbytes, organized in 256 Pages of 128 Bytes (AT91SAM7S321/32)
  – 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
  – 64 kbytes (AT91SAM7S256)
  – 32 kbytes (AT91SAM7S128)
  – 16 kbytes (AT91SAM7S64)
  – 8 kbytes (AT91SAM7S321/32)
• Memory Controller (MC)
  – Embedded Flash Controller, Abort Status and Misalignment Detection
• Reset Controller (RSTC)
  – Based on Power-on Reset and Low-power Factory-calibrated Brown-out 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)
  – Software Power Optimization Capabilities, Including Slow Clock Mode (Down to 500 Hz) and Idle Mode
  – Three Programmable External Clock Signals
• Advanced Interrupt Controller (AIC)
  – Individually Maskable, Eight-level Priority, Vectored Interrupt Sources
  – Two (AT91SAM7S256/128/64/321) or One (AT91SAM7S32) 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
• One Parallel Input/Output Controller (PIOA)
  – Thirty-two (AT91SAM7S256/128/64/321) or twenty-one (AT91SAM7S32) 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
• Eleven (AT91SAM7S256/128/64/321) or Nine (AT91SAM7S32) Peripheral DMA Controller (PDC) Channels
• One USB 2.0 Full Speed (12 Mbits per Second) Device Port (Except for the AT91SAM7S32).
  – On-chip Transceiver, 328-byte Configurable Integrated FIFOs
• One Synchronous Serial Controller (SSC)
  – Independent Clock and Frame Sync Signals for Each Receiver and Transmitter
  – I©÷S Analog Interface Support, Time Division Multiplex Support
  – High-speed Continuous Data Stream Capabilities with 32-bit Data Transfer
• Two (AT91SAM7S256/128/64/321) or One (AT91SAM7S32) Universal Synchronous/Asynchronous Receiver Transmitters(USART)
  – Individual Baud Rate Generator, IrDA? Infrared Modulation/Demodulation
  – Support for ISO7816 T0/T1 Smart Card, Hardware Handshaking, RS485 Support
  – Manchester Encoder/Decoder (AT91SAM7S256/128)
  – Full Modem Line Support on USART1 (AT91SAM7S256/128/64/321)
• One Master/Slave Serial Peripheral Interface (SPI)
  – 8- to 16-bit Programmable Data Length, Four External Peripheral Chip Selects
• One Three (AT91SAM7S256/128/64/321)-channel or Two (AT91SAM7S32)-channel 16-bit Timer/Counter (TC)
  – Three (AT91SAM7S256/128/64/321) or One (AT91SAM7S32) 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 PWM Controller (PWMC)
• One Two-wire Interface (TWI)
  – Master Mode Support Only, All Two-wire Atmel EEPROMs Supported
• One 8-channel 10-bit Analog-to-Digital Converter, Four Channels Multiplexed with Digital I/Os
• SAM-BA¢â Boot Assistant
  – Default Boot program
  – Interface with SAM-BA Graphic User Interface
• IEEE 1149.1 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 or 1.8V VDDIO I/O Lines Power Supply, Independent 3.3V VDDFLASH Flash Power Supply
  – 1.8V VDDCORE Core Power Supply with Brown-out Detector
• Fully Static Operation: Up to 55 MHz at 1.65V and 85¡ÆC Worst Case Conditions
• Available in a 64-lead LQFP Green Package (AT91SAM7S256/128/64/321) and 48-lead LQFP Green Package (AT91SAM7S32)

Description

Atmel¡¯s AT91SAM7S is a series of low pincount Flash microcontrollers based on the 32-bit ARM RISC processor. It features a high-speed Flash and an SRAM, a large set of peripherals, including a USB 2.0 device (except for the AT91SAM7S32), and a complete set of system functions minimizing the number of external components. The device is an ideal migration path for 8-bit microcontroller users looking for additional performance and extended memory.
The embedded Flash memory can be programmed in-system via the JTAG-ICE interface or via a parallel interface on a production programmer prior to mounting. Built-in lock bits and a security bit protect the firmware from accidental overwrite and preserves its confidentiality.
The AT91SAM7S Series system controller includes a reset controller capable of managing the power-on sequence of the microcontroller and the complete system. Correct device operation can be monitored by a built-in brownout detector and a watchdog running off an integrated RC oscillator.
The AT91SAM7S Series are general-purpose microcontrollers. Their integrated USB Device port makes them ideal devices for peripheral applications requiring connectivity to a PC or cellular phone. Their aggressive price point and high level of integration pushes their scope of use far into the cost-sensitive, high-volume consumer market.