ATMega 328p chip

The Atmega328 is one of the
microcontroller chips that are used with
the popular Arduino Duemilanove
boards. Of these 2, the Atmega328 is
the upgraded, more advanced chip. Unlike the Atmega168 which has 16K of
flash program memory and 512 bytes
of internal SRAM, the Atmega328 has
32K of flash program memory and 2K
of Internal SRAM.