IN80C51N

IN80C31N/IN80C51N CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER The 80C31/80C51 is a high-performance microcontroller fabricated with high-density CMOS technology. The 80C51 contains a 4k x 8 ROM , a 128 x 8 RAM , 32 I/O lines, two 16-bit counter/timers, a five-source, two-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART, and onchip oscillator and clock circuits. The device has two software selectable modes of power reduction  idle mode and power-down mode. The idle mode freezes the CPU while allowing the RAM, timers, serial port, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative. FEATURES 8031/8051 compatible  4k x 8 ROM (80C51)  ROMless (80C31)  128 x 8 RAM  Two 16-bit counter/timers  Full duplex serial channel  Boolean processor Memory addressing capability  64k ROM and 64k RAM Power control modes:  Idle mode  Power-down mode CMOS and TTL compatible Two speed ranges at VCC=5V  12 MHz  16 MHz (MCS-51 family) PIN CONFIGURATIONS P 1 .0 P 1 .1 P 1 .2 P 1 .3 P 1 .4 P 1 .5 P 1 .6 P 1 .7 R ST R x D /P 3 .0 T x D /P 3 .2 I N T 0 /P 3 .2 I N T 1 /P 3 .3 T 0 /P 3 .4 T 1 /P 3 .5 W R /P 3 6 R D /P 3 .7 XTAL2 XTAL1 V ss 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 P L A S T IC DUAL IN - L IN E PAC KAGE 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 V...