Description
The AT91X40 Series is a subset of the Atmel AT91 16/32-bit microcontroller family, which is based on the ARM7TDMI processor core. This processor has a high-performance 32-bit RISC architecture with a high-density 16-bit instruction set and very low power consumption. In addition, a large number of internally banked registers result in very fast exception handling, making the device ideal for real-time control applications.

Features
• Incorporates the ARM7TDMI™ ARM® Thumb® Processor Core
   – High-performance 32-bit RISC Architecture
   – High-density 16-bit Instruction Set
   – Leader in MIPS/Watt
   – Embedded ICE (In-Circuit Emulation)
• On-chip SRAM and/or ROM
   – 32-bit Data Bus
   – Single-clock Cycle Access
• Fully Programmable External Bus Interface (EBI)
   – Maximum External Address Space of 64M Bytes
   – Up to 8 Chip Selects
   – Software Programmable 8/16-bit External Databus
• 8-level Priority, Individually Maskable, Vectored Interrupt Controller
   – 4 External Interrupts, Including a High-priority Low-latency Interrupt Request
• 32 Programmable I/O Lines
• 3-channel 16-bit Timer/Counter
   – 3 External Clock Inputs
   – 2 Multi-purpose I/O Pins per Channel
• 2 USARTs
   – 2 Dedicated Peripheral Data Controller (PDC) Channels per USART
• Programmable Watchdog Timer
• Advanced Power-saving Features
   – CPU and Peripheral Can be Deactivated Individually
• Available in a 100-lead TQFP Package