picoPower technology AVR Microcontroller.
4K Bytes of In-System Self-Programmable Flash, 64 Bytes In-System Programmable EEPROM, 256 Bytes Internal SRAM. 8-bit timer/counter and 16-bit timer/counter with PWM, 10-bit ADC, SPI-Serial Peripheral Interface. debugWIRE for on-chip-debug. Up to 12 MIPS throughput at 12 MHz. 1.8 - 5.5 V operation.

• 4KB version: ATtiny48
• 8KB version: ATtiny88