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W742C81A Datasheet

  • W742C81A

  • 4-BIT MICROCONTROLLER

  • 45頁(yè)

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Preliminary W742E81A/W742C81A
4-BIT MICROCONTROLLER
1. GENERAL DESCRIPTION
The W742E81A/W742C81A is a high-performance 4-bit microcontroller (碌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
脳
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
鈥?/div>
Operating voltage: 2.4V鈭?.8V
鈥?/div>
Dual-clock operation or single-clock operation (By option)
鈥?/div>
Main-oscillator
鈭?/div>
Connect to 3.58 MHz crystal or 400 KHz that can be selected by option code
鈭?/div>
Crystal or RC oscillator can be selected by code option (W742E81A)
鈭?/div>
Connect to 2 MHz typical RC oscillator (W742C81A)
鈥?/div>
Sub-oscillator
鈭?/div>
Connect to 32768 Hz crystal only
鈥?/div>
Memory
鈭?/div>
16384 x 16 bits program flash EEPROM (including 64K x 4 bit look-up table)
鈭?/div>
2048 x 4 bits data RAM (including 16 nibbles x 16 pages working registers)
鈭?/div>
40 x 4 LCD data RAM
鈥?/div>
24 input/output pins
鈭?/div>
Port for input only: 1 ports/4 pins(RC)
鈭?/div>
Input/output ports: 3 ports/12 pins(RA, RB & RD)
鈭?/div>
High sink current output port for LED driving: 1 port /4 pins(RE)
鈭?/div>
Port for output only: 1 port/ 4 pins(RF)
鈥?/div>
Power-down mode
鈭?/div>
Hold function: no operation (main-oscillator and sub-oscillator still operate)
鈭?/div>
Stop function: no operation (main-oscillator and sub-oscillator are stopped)
鈭?/div>
Dual-clock slow operation mode: system is operated by the sub-oscillator (F
OSC
=Fs and Fm is
stopped)
鈥?/div>
Five types of interrupts
鈭?/div>
Four internal interrupts (Divider0, Divider1, Timer 0, Timer 1)
鈭?/div>
One external interrupts (RC Port)
-1-
Publication Release Date: April 2000
Revision A1

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