Описание
The AT91SAM7A3 is a member of a series of 32-bit ARM7 microcontrollers with an integrated CAN controller. It features a 256-Kbyte high-speed Flash and 32-Kbyte SRAM, a large set of peripherals, including two 2.0B full CAN controllers, 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. Built-in lock bits protect the firmware from accidental overwrite. The AT91SAM7A3 integrates a complete set of features facilitating debug, including a JTAG Embedded ICE interface, misalignment detector, interrupt driven debug communication channel for user configurable trace on a console, and JTAG boundary scan for board level debug and test.
- Incorporates the ARM7TDMI ® ARM® Thumb® Processor
- High-performance 32-bit RISC Architecture
- High-density 16-bit Instruction Set
- Leader in MIPS/Watt
- Embedded ICE™ In-circuit Emulation, Debug Communication Channel Support
- 256 Kbytes of Internal High-speed Flash, Organized in 1024 of 256 Bytes
- Single Cycle Access at Up to 30 MHz in Worst Case Conditions
- Prefect Buffer Optimizing Thumb Instruction Execution at Maximum Speed
- Programming Time: 6 ms, Including Auto-erase, Full Erase Time: 15 ms
- 10,000 Write Cycles, 10-year Data Retention Capability, Sector Lock Capabilities
- 32K Bytes of Internal High-speed SRAM, Single-cycle Access at Maximum Speed
- Memory Controller (MC)
- Embedded Flash Controller, Abort Status and Misalignment Detection
- Memory Protection Unit
- Reset Controller (RSTC)
- Based on Three Power-on Reset Cells
- Provides External Reset Signal Shaping and Reset Sources 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), Idle Mode, Standby Mode and Backup Mode
- Four Programmable External Clock Signals
- Advanced Interrupt Controller (AIC)
- Individually Mask able, Eight-level Priority, Vectored Interrupt Sources
- Four External Interrupt Sources and One Fast Interrupt Source, Spurious Interrupt Protected
- Debug Unit (DBGU)
- 2-wire UART and Support for Debug Communication Channel interrupt
- 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 Signal to the System
- Counter May Be Stopped While the Processor is in Debug Mode or in Idle State
- 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
- Shutdown Controller (SHDWC)
- Programmable Shutdown Pin and Wake-up Circuitry
- Two 32-bit Battery Backup Registers for a Total of 8 Bytes
- One 8-channel 20-bit PWM Controller (PWMC)
- One USB 2.0 Full Speed (12 Mbits per Second) Device Port
- On-chip Transceiver, 2376-byte Configurable Integrated FIFOs
