TOPWAY

LCD Module User Manual

LM3123ABO

www.topwaysz.com

Document Name: LM3123ABO-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

Select duty = 1/32

Static drive ON/OFF = OFF (Normal Driving)

ADC = 1

Display Start Line = 0

DISPLAY ON/OFF = ON

Read-Modify-Write = OFF

4.2

Resetting the LCD Module

The LCD module should be initialized by the hardware reset during power on sequence.

Keep /RES terminal at high level, during the power on.

After the power supply is stable, a hardware reset signal should apply to the /RES terminal.

The LCD module will be initialized at the rising and falling edge of the /RES signal.

For normal running, /RES signal must keep at high level.

After the Hardware Reset, the LCD module controllers’ status will be:

(note: this is not the basic setting for normal display)

-

Display ON/OFF = OFF

-

Display start line register = 0

-

Static drive ON/OFF = OFF (Normal Driving)

-

Column address counter = 0

-

Page address register = Page 3

-

Select duty = 1/32

-

ADC = 1

-

Read-Modify-Write = OFF

4.3

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

LCD module

VOUT

V0

VSS

VDD

VR