80 Series

80C51 - CMOS Single-Chip 8 Bit Microcontroller

Photograph

Features Pin Compatible with NMOS 8031 Power Control Modes 128 bytes of RAM 4 K bytes of ROM 32 programmable I/O Lines Two 16 bit Timer/Counter 64k Program Memory Space 64k Data Memory Space 5 interrupt sources Programmable Serial Port

Pin Description Pin Number Description 1-8 P1.0 - P1.7 - Port 1 9 RST - Reset 10 P3.0/RXD - Port 3.0 / Serial Receive Pin 11 P3.1/TXD - Port 3.1 / Serial Transmit Pin 12 P3.2/INT0 - Port 3.2 / Interrupt 0 (Active Low) 13 P3.3/INT1 - Port 3.3 / Interrupt 1 (Active Low) 14 P3.4/T0 - Port 3.4 / Timer 0 15 P3.5/T1 - Port 3.5 / Timer 1 16 P3.6/WR - Port 3.6 / Write (Active Low) 17 P3.7/RD - Port 3.7 / Read (Active Low) 18 XTAL2 - Crystal Input 19 XTAL1 - Crystal Input 20 Vss - Ground 21 - 28 P2.0 - P2.7 - Port 2 29 PSEN - Program Store Enable (Active Low) 30 ALE - Address Latch Enable 31 EA - External Memory Enable (Active Low) 32 - 39 P0.7 - P0.1 - Port 0 40 Vcc - Positive Supply

Pin Layout Dimensional Drawing

Technical Data Data Sheet Data Sheet for 80C51 Application Notes