1

Features

– High-performance 32-bit RISC Architecture

– High-density 16-bit Instruction Set

– Leader in MIPS/Watt

– Embedded ICE (In-Circuit Emulation)

– Maximum External Address Space of 64M Bytes

– Up to 8 Chip Selects

– Software Programmable 8/16-bit External Data Bus

– 5 External Interrupts, Including a High-priority, Low-latency Interrupt Request

– 6 External Clock Inputs

– 2 Multi-purpose I/O Pins per Channel

– 2 Dedicated Peripheral Data Controller (PDC) Channels per USART

– Support for up to 9-bit Data Transfers

– 2 Dedicated Peripheral Data Controller (PDC) Channels per SPI

– 8- to 16-bit Programmable Data Length

– 4 External Slave Chip Selects per SPI

– Period Interval Timer (PIT); Real-time Timer (RTT); Watchdog Timer (WDT)

– CPU and Peripherals Can be Deactivated Individually

– Support for 31.25 kHz and 38.4 kHz Crystals

– Software Programmable System Clock (up to 33 MHz)

°C to +85°C Operating Temperature Range

Description

The AT91M42800 Microcontroller is a member of the Atmel AT91 16/32-bit Microcon-

troller 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 reg-

isters result in very fast exception handling, making the device ideal for real-time

control applications. The AT91 ARM-based MCU family also features Atmel’s high-

density, in-system programmable, nonvolatile memory technology. The AT91M42800

has a direct connection to off-chip memory, including Flash, through the External Bus

Interface.

The Power Management Controller allows the user to adjust the device activity

according to system requirements, and, with the 32.768 kHz low-power oscillator,

enables the AT91M42800 to reduce power requirements to an absolute minimum.

The AT91M42800 is manufactured using Atmel’s high-density CMOS technology. By

combining the ARM7TDMI processor core with on-chip SRAM and a wide range of

peripheral functions including timers, serial communication controllers and a versatile

clock generator on a monolithic chip, the AT91M42800 provides a highly flexible and

cost-effective solution to many compute-intensive applications.

AT91

Microcontrollers

AT91M42800

Summary

Rev. 1328AS–06/00