Atmel AT89C55 AVR Microcontroller 8-bit

Features:  20K Bytes of In-System Reprogrammable Flash Memory  Endurance: 1,000 Write/Erase Cycles  Fully Static Operation: 0 Hz to 33 MHz  Three-Level Program Memory Lock  256 x 8-bit Internal RAM  32 Programmable I/O Lines  Three 16-bit Timer/Counters  Eight Interrupt Sources  Low Power Idle and Power Down Modes