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Fig.1 Block diagram.

handbook, full pagewidth

MGL743

LCD

VOLTAGE

SELECTOR

CLOCK SELECT

AND TIMING

BLINKER

TIMEBASE

OSCILLATOR

INPUT

FILTERS

CONTROLLER

POWER-ON

RESET

CLK

SYNC

OSC

SCL

SDA

SA0

BACKPLANE

OUTPUTS

DISPLAY

CONTROL

BP0 BP1 BP2 BP3

DISPLAY SEGMENT OUTPUTS

DISPLAY REGISTER

OUTPUT BANK SELECT

AND BLINK CONTROL

80

S0 to S79

SDAACK

VDD

A0

A1

A2

PCF8533

LCD BIAS

GENERATOR

VSS

VLCD

COMMAND

DECODE

WRITE DATA

CONTROL

DISPLAY

RAM

DATA POINTER AND

AUTO INCREMENT

SUBADDRESS

COUNTER