Atmel

AT89C51 - 8 bit Microcontroller with 4k Bytes Flash

Photograph

Features Compatible with MCS-51 Products 4K Bytes of In-System Reprogrammable Flash Memory Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 128 x 8-bit Internal RAM 32 Programmable I/O Lines Two 16-bit Timer/Counters Six Interrupt Sources Programmable Serial Channel Low-power Idle and Power-down Modes 40-pin DIP

Pin Description Pin Number Description 1 - 8 P1.0 - P1.7 - Port 1 9 RST - Reset 10 - 17 P3.0 - P3.7 - Port 3 18 XTAL2 - Crystal 19 XTAL1 - Crystal 20 GND - Ground 21 - 28 P2.0 - P2.7 - Port 2 29 PSEN - Program Store Enable 30 ALE - Address Latch Enable 31 EA - External Access Enable 32 - 39 P0.7 - P0.1 - Port 0 40 Vcc - Positive Power Supply

Pin Layout Dimensional Drawing

Technical Data Data Sheet Atmel - Data Sheet for AT89C51 Application Notes Atmel - 80 Series Application Notes