Help find data sheet for micro-controller?
Here you go. Datasheet for the ATmega48A; ATmega48PA; ATmega88A; ATmega88PA; ATmega168A; ATmega168PA; ATmega328; ATmega328P - Atmel 8-bit Microcontroller with 4/8/16/32KBytes InSystem Programmable Flash

This microcontroller can be used to make your home-grown Arduino clone, among other things. The DIP part lends itself to making the Really Bare Bones Board quite well.