AT91M40400_99 Datasheet, PDF (1/116 Pages) ATMEL Corporation – AT91 ARM Thumb Microcontrollers

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)
• 4K Bytes Internal RAM
• 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
• Low-power Idle Mode
• Fully Static Operation: 0 Hz to 33 MHz
• 2.7V to 3.6V Operating Range
• Available in a 100-lead TQFP Package
AT91
ARM^® Thumb^®
Microcontrollers
AT91M40400
1
Description
The AT91M40400 is a member 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 applica-
tions.
The AT91M40400 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 conjuction with the Peripheral Data Controller signifi-
cantly improve the real-time performance of the device.
The device is manufactured using Atmel’s high density CMOS technology. By combin-
ing the ARM7TDMI microcontroller core with on-chip RAM and a wide range of periph-
eral functions on a monolithic chip, the Atmel AT91M40400 is a powerful microcontrol-
ler that offers a flexible, cost-effective solution to many compute-intensive embedded
control applications.
Rev. 0768C–10/99
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