Microchip, 8bit ATmega328, ATmega Microcontroller, 20MHz, 32 Kb EEPROM, 32-Pin TQFP

The Microchip 8 bit AVR RISC based microcontroller combines 64 KB ISP Flash memory with read while write capabilities, 2 KB EEPROM, 4 KB SRAM, 27 general purpose I/O lines, 32 general purpose working registers, two flexible timer/counters with compare modes and PWM, one UART with HW LIN, an 11 channel 10 bit A/D converter with two differential programmable gain input stages, a 10 bit D/A converter, a programmable watchdog timer with an internal individual oscillator, SPI serial port, an on chip debug system, and four software selectable power saving modes. The device operates between 2.7 to 5.5 volts.

131 powerful instructions
Most single clock cycle execution
32 x 8 general purpose working registers
Fully static operation
Up to 20 MIPS throughput at 20 MHz