Atmel AT91 Series User Manual

Features
•
Incorporates the ARM7TDMI
– 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
Microcontroller Primary SRAM Bank
AT91M40800
AT91R40807
AT91M40807
AT91R40008
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-perfor-
mance 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.
The AT91X40 Series features a direct connection to off-chip memory, including Flash,
through the fully programmable External Bus Interface (EBI). An eight-level priority
vectored interrupt controller, in conjunction with the Peripheral Data Controller signifi-
cantly improve the real-time performance of the device.
The devices are manufactured using Atmel's high-density CMOS technology. By com-
bining the ARM7TDMI processor core with on-chip high-speed memory and a wide
range of peripheral functions on a monolithic chip, the Atmel AT91X40 Series is a fam-
ily of powerful microcontrollers that offer a flexible, cost-effective solution to many
compute-intensive embedded control applications.
™ ® ®
ARM Thumb Processor Core
Secondary SRAM Bank
8K Bytes
8K Bytes
8K Bytes
256K Bytes
ROM
–
128K Bytes
– 128K Bytes
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AT91
®
ARM
Microcontrollers
AT91M40800
AT91R40807
AT91M40807
AT91R40008
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–
–
®
Thumb
Rev. 1354D–ATARM–05/02
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