Microchip ATTINY85-20MU, 8bit AVR Microcontroller, ATtiny85, 20MHz, 8 kB Flash, 8-Pin VQFN

The high-performance, low-power Microchip 8-bit AVR RISC-based microcontroller combines 128KB flash memory with read-while-write capabilities, 4KB EEPROM, 4KB SRAM, 53 general purpose I/O lines, 32 general purpose working registers, real time counter, four flexible timer/Counters: compare modes and PWM, two USARTs , a byte oriented Two-wire serial interface, an 8-channel/10-bit A/D converter with optional differential input stage with programmable gain, programmable watchdog timer with internal oscillator.

High-performance, Low-power Atmel AVR 8-bit Microcontroller
Advanced RISC Architecture
133 Powerful Instructions - Most Single-clock Cycle Execution
32 x 8 General Purpose Working Registers + Peripheral Control Registers
Fully Static Operation
Up to 16MIPS Throughput at 16MHz
On-chip 2-cycle Multiplier
High Endurance Non-volatile Memory segments
128Kbytes of In-System Self-programmable Flash program