The Microchip technology AT91 family type, LQFP package, surface mount, 100-pin ARM7TDMI 32-bit microcontroller has a maximum voltage rating of 3.6 V. It operates at a maximum speed of 55MHz and features 256kb of flash and 64kb of SRAM. The peripheral set includes USB 2.0 full-speed device port, Ethernet MAC 10/100 port, two USART, UART, two SPI, SSC, TWI (I2C), three 16-bit timers, RTT and 8x10-bit ADC. It has 62 programmable I/O lines multiplexed with up to two peripheral I/Os.

• 16-bit PWM resolution
• CAN Controller 2.0A and 2.0B
• Embedded ICE T0/T1 smart card, hardware handshaking, RS485 support
• Four programmable external clock signals have 8-bit asynchronous timer/counter
• High endurance non-volatile memory segments
• High-performance 32-bit RISC architecture
• It has seven mode of operations - User, fast interrupt, interrupt, supervisor, abort, system and undefined
• On-chip 2-cycle multiplier
• Operation temperature ranges between -40°C and 85°C
• Sleep modes- idle, ADC noise reduction, power-save, power-down and standby
• Two 8-bit to 16-bit master/slave serial peripheral interfaces (SPI)
• Windowed watchdog timer

• Embedded systems
• LCD monitors and TVs
• Mobile PC docking
• PC motherboards
• Portable hub boxes
• Printers and scanners