Features 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 64M Bytes AT91 ARM Up to 8 Chip Selects Software Programmable 8/16-bit External Data Bus Thumb 8-channel Peripheral Data Controller 8-level Priority, Individually Maskable, Vectored Interrupt Controller Microcontrollers 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 AT91M42800A 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 1149.1 JTAG Boundary Scan on All Active Pins Fully Static Operation: 0 Hz to 33 MHz, Internal Frequency Range at V = 3.0V, DDCORE 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) Rev. 1779DATARM14-Apr-061. 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 Atmels 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 Atmels 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. 2 AT91M42800A 1779DATARM14-Apr-06