器件名称: W742C81A
功能描述: 4-BIT MICROCONTROLLER
文件大小: 567.84KB 共45页
简 介:Preliminary W742E81A/W742C81A 4-BIT MICROCONTROLLER
1. GENERAL DESCRIPTION
The W742E81A/W742C81A 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 dualclock 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 W742E81A/W742C81A 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: 2.4V3.8V Dual-clock operation or single-clock operation (By option) Main-oscillator
Connect to 3.58 MHz crystal or 400 KHz that can be selected by option code Crystal or RC oscillator can be selected by code option (W742E81A) Connect to 2 MHz typical RC oscillator (W742C81A)
Sub-oscillator
Connect to 32768 Hz crystal only
Memory
16384 x 16 bits program flash EEPROM (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 (m……
