W742S81A
| Model | W742S81A |
| Description | 4 BIT MICROCONTROLLER |
| PDF file | Total 47 pages (File size: 240K) |
| Chip Manufacturer | WINBOND |
W742S81A
4-BIT MICROCONTROLLER
1. GENERAL DESCRIPTION
The W742S81A 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 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-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)
Publication Release Date: March 2003
- 1 -
Revision A1
