器件名称: W742S81A
功能描述: 4 BIT MICROCONTROLLER
文件大小: 242.7KB 共47页
简 介:W742S81A 4-BIT MICROCONTROLLER
1. GENERAL DESCRIPTION
The W742S81A is a high-performance 4-bit microcontroller (C) that provides an LCD driver. The device contains a 4-bit ALU, two 8-bit timers, two dividers (for two oscillators) in dual-clock operation, a 40 × 4 LCD driver, six 4-bit I/O ports (including 1 output port for LED driving), and one channel DTMF generator. There are also five interrupt sources and 16-levels subroutine nesting for interrupt applications. The W742S81A operates on very low current and has two power reduction modes, that is the dual-clock slow operation and STOP mode, which help to minimize power dissipation.
2. FEATURES
Operating
voltage: 2.4V – 5.5V Dual-clock operation or single-clock operation (By option) Main-oscillator Connect to 3.58MHz crystal or 400KHz that can be selected by option code Crystal or RC oscillator can be selected by code option Sub-oscillator Connect to 32768 Hz crystal only Memory 16384 x 16 bits program electrical erasable EPROM (including 64K x 4 bit look-up table) 2048 x 4 bits data RAM (including 16 nibbles x 16 pages working registers) 40 x 4 LCD data RAM 24 input/output pins Port for input only: 1 ports/4 pins(RC) Input/output ports: 3 ports/12 pins(RA, RB & RD) High sink current output port for LED driving: 1 port /4 pins(RE)
Port for output only: 1 port/ 4 pins(RF) Power-down mode Hold function: no operation ( main-oscillator and sub-oscillator still operate) Stop function: no operation ( main-osc……
