W742C81A
Model | W742C81A |
Description | 4-BIT MICROCONTROLLER |
PDF file | Total 45 pages (File size: 557K) |
Chip Manufacturer | WINBOND |
Preliminary W742E81A/W742C81A
4-BIT MICROCONTROLLER
1. GENERAL DESCRIPTION
The W742E81A/W742C81A is a high-performance 4-bit microcontroller (µC) 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 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: 2.4V−3.8V
•
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 (main-oscillator and sub-oscillator still operate)
−
Stop function: no operation (main-oscillator and sub-oscillator are stopped)
−
Dual-clock slow operation mode: system is operated by the sub-oscillator (F
OSC
=Fs and Fm is
stopped)
•
Five types of interrupts
−
Four internal interrupts (Divider0, Divider1, Timer 0, Timer 1)
−
One external interrupts (RC Port)
-1-
Publication Release Date: April 2000
Revision A1