High-performance, low-power Microchip 8-bit AVR® RISC-based microcontroller The controller combines 2 KB ISP Flash memory, 128B ISP EEPROM, 128B internal SRAM, universal serial interface (USI), full duplex UART, and debugWIRE for on-board. chip debugging. The device supports a throughput of 20 MIPS at 20 MHz and operates between 2.7-5.5 volts.