Features
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Utilizes the ARM7TDMI
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ARM
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Processor Core
– High-performance 32-bit RISC Architecture
– High-density 16-bit Instruction Set
– Leader in MIPS/Watt
– Embedded ICE (In-circuit Emulation)
8K Bytes Internal SRAM
Fully Programmable External Bus Interface (EBI)
– Maximum External Address Space of 64M Bytes
– Up to 8 Chip Selects
– Software Programmable 8/16-bit External Data Bus
8-channel Peripheral Data Controller
8-level Priority, Individually Maskable, Vectored Interrupt Controller
– 5 External Interrupts, Including a High-priority, Low-latency Interrupt Request
54 Programmable I/O Lines
6-channel 16-bit Timer/Counter
– 6 External Clock Inputs, 2 Multi-purpose I/O Pins per Channel
2 USARTs
– 2 Dedicated Peripheral Data Controller (PDC) Channels per USART
– Support for up to 9-bit Data Transfers
2 Master/Slave SPI Interfaces
– 2 Dedicated Peripheral Data Controller (PDC) Channels per SPI
– 8- to 16-bit Programmable Data Length
– 4 External Slave Chip Selects per SPI
3 System Timers
– Period Interval Timer (PIT); Real-time Timer (RTT); Watchdog Timer (WDT)
Power Management Controller (PMC)
– CPU and Peripherals Can be Deactivated Individually
Clock Generator with 32.768 kHz Low-power Oscillator and PLL
– Support for 38.4 kHz Crystals
– Software Programmable System Clock (up to 33 MHz)
IEEE
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1149.1 JTAG Boundary Scan on All Active Pins
Fully Static Operation: 0 Hz to 33 MHz, Internal Frequency Range at V
DDCORE
= 3.0V,
85° C
2.7V to 3.6V Core and PLL Operating Voltage Range; 2.7V to 5.5V I/O Operating Voltage
Range
-40° C to +85° C Temperature Range
Available in a 144-lead LQFP Package (Green) and a 144-ball BGA Package (RoHS
compliant)
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AT91 ARM
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Microcontrollers
AT91M42800A
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Rev. 1779D–ATARM–14-Apr-06
1. Description
The AT91M42800A 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-performance 32-bit RISC
architecture with a high-density 16-bit instruction set and very low power consumption. In addi-
tion, a large number of internally banked registers 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 AT91M42800A has a direct connection to off-chip memory, including Flash, through the
External Bus Interface.
The Power Management Controller allows the user to adjust device activity according to sys-
tem requirements, and, with the 32.768 kHz low-power oscillator, enables the AT91M42800A
to reduce power requirements to an absolute minimum. The AT91M42800A 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 communi-
cation controllers and a versatile clock generator on a monolithic chip, the AT91M42800A
provides a highly flexible and cost-effective solution to many compute-intensive applications.
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AT91M42800A
1779D–ATARM–14-Apr-06
PCB Design
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