Features
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Utilizes 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)
8K Bytes Internal SRAM
Fully-programmable External Bus Interface (EBI)
– Maximum External Address Space of 128M Bytes
– 8 Chip Selects
– Software Programmable 8/16-bit External Databus
8-level Priority, Individually Maskable, Vectored Interrupt Controller
– 7 External Interrupts, Including a High-priority, Low-latency Interrupt Request
58 Programmable I/O Lines
6-channel 16-bit Timer/Counter
– 6 External Clock Inputs and 2 Multi-purpose I/O Pins per Channel
3 USARTs
Master/Slave SPI Interface
– 8-bit to 16-bit Programmable Data Length
– 4 External Slave Chip Selects
Programmable Watchdog Timer
8-channel 10-bit ADC
2-channel 10-bit DAC
Clock Generator with On-chip Main Oscillator and PLL for Multiplication
– 3 to 20 MHz Frequency Range Main Oscillator
Real-time Clock with On-chip 32 kHz Oscillator
– Battery Backup Operation and External Alarm
8-channel Peripheral Data Controller for USARTs and SPIs
Advanced Power Management Controller (APMC)
– Normal, Wait, Slow, Standby and Power-down modes
IEEE 1149.1 JTAG Boundary-scan on all Digital Pins
Fully Static Operation: 0 Hz to 33 MHz Internal Frequency Range
at VDDCORE = 3.0V, 85°C
2.7V to 3.6V Core Operating Range, 2.7V to 5.5V I/O Operating Range
2.7V to 3.6V Analog Operating Range
1.8V to 3.6V Backup Battery Operating Range
2.7V to 3.6V Oscillator and PLL Operating Range
-40°C to +85°C Temperature Range
Available in a 176-lead TQFP or 176-ball BGA Package
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AT91
ARM
®
Thumb
®
Microcontrollers
AT91M55800A
Summary
Description
The AT91M55800A 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 applications.
The fully programmable External Bus Interface provides a direct connection to off-chip
memory in as fast as one clock cycle for a read or write operation. An eight-level prior-
ity vectored interrupt controller in conjunction with the peripheral data controller
significantly improve the real-time performance of the device.
The device is manufactured using Atmel’s high-density CMOS technology. By combin-
ing the ARM7TDMI processor core with an on-chip SRAM, a wide range of peripheral
functions, analog interfaces and low-power oscillators on a monolithic chip, the Atmel
AT91M55800A is a powerful microcontroller that provides a highly-flexible and cost-
effective solution to many ultra low-power applications.
Rev. 1745CS–ATARM–05/02
Note: This is a summary document. A complete document
1
is available on our web site at www.atmel.com.
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