8-bit MegaAVR microcontrollers picoPower ATmega328P The Atmel ATmega328P (click to buy) microcontroller is an 8-bit megaAVR device based on the AVR-enhanced RISC architecture. Introduced picoPower technology, which provides ultra-low power consumption and low power sleep modes ideal for battery powered applications.
You can download atmega328p au datasheet here