mega1284 2467XS–AVR–0611 ATmega128 The Atmel® AVR® core combines a rich instruction set with 32 general purpose working regis- ters. All the 32 registers are directly connected toPart #: ATMEGA128. Description: 8-bit Microcontroller with 128K Bytes In-System Programmable Flash. File Size: 360.86 Kbytes. Manufacturer: ATMEL Corporation.