AT91SAM7S256 Datasheet, PDF (1/42 Pages) ATMEL Corporation – AT91 ARM THUMB-BASED MICROCONTROLLERS

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^™ 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
AT91 ARM^®
Thumb^®-based
Microcontrollers
AT91SAM7S256
AT91SAM7S128
AT91SAM7S64
AT91SAM7S321
AT91SAM7S32
Summary
6175BS–ATARM–04-Nov-05