Atmel AVR
The AVR is a modified Harvard architecture 8-bit RISC single chip microcontroller which was developed by Atmel in 1996. The AVR was one of the first microcontroller families to use on-chip flash memory for program storage, as opposed to one-time programmable ROM, EPROM, or EEPROM used by other microcontrollers at the time.
Read more about Atmel AVR: Brief History, Device Overview, Programming Interfaces, Debugging Interfaces, Development Tools and Evaluation Kits, Atmel AVR Usage, FPGA Clones