The Atmel AT89C2051 is a 20 Pin 8051 compatible 8 bit microcontroller. It has a 2 KB Flash, a wide range of operating voltage of 2.7 - 6 V, 15 I/O Lines, 2 Timer/Counters, 6 Interrupt/2 Priority Levels, Analog Comparator, LED Drive Outputs, a Programmable Serial UART Channel, Two-level Program Memory Lock and 128 Bytes On-chip RAM.

 Atmel AT89C2051 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.