TOPWAY

LCD Module User Manual

LM6800AFW-5

www.topwaysz.com

Document Name: LM6800AGW-6-Manual-Rev0.1.DOC

Page: 7 of 10

4. Function Specifications

4.1

Basic Setting

To drive the LCD module correctly and provide normally display, please use the following setting

Display start line (Z address)= 0

LCD Display = on

Note:

These setting/commands should issue to all controllers while start up.

See the Display Control Instructions section for details.

4.2

Adjusting the LCD display contrast

A Variable-Resistor must be connected to

the LCD module for providing a reference to

V0. Adjusting the VR will result the change

of LCD display contrast.The recommended

value of VR is 25k to 50k

4.3

Resetting the LCD module

The LCD module should be initialized by setting /RST terminal at low level when turning the power

on.

When /RST pull low, the LCD module will:

-

Display off

-

Display start line register becomes 0. (Z-address=0)

While /RST is low, no instruction can be accepted except status read. Therefore, execute other

instructions after making sure that DB4=0 (clear /RST) and DB7=0 (ready) by status read

instruction. The conditions of power supply at initial power up are as follow:

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset time

trs

2.0

-

-

us

Rise time

tr

-

-

150

ns

LCD module

VOUT

V0

VSS

VDD

VR