TOPWAY

LCD Module User Manual

LM3123

www.topwaysz.com

Document Name: LM3123-Manual-Rev0.3.doc

Page: 4 of 9

1.4

Terminal Functions

Pin

No.

Pin

Name

I/O

Descriptions

1

VSS

Power

Negative Power Supply, Ground (0V)

2

VDD

Power

Positive Power Supply

3

V0

Input

LCD Contrast Reference

4

VOUT Power

LCD Booster Output for V0

5

/RES

Input

Reset Signal

Resetting: rising edge and falling edge of /RES

Normal Running: /RES=High

6

DB7

:

13

DB0

I/O

Bi-directional Data Bus for display data or instruction data

14

R/W

Input

Read / Write Control Signal

15

A0

Input

A0 = H; DB0 – DB7 = Display Data

A0 = L; DB0 – DB7 = Instruction Data

16

E1

Input

Enable Signal for left section of the LCD module

17

E2

Input

Enable Signal for middle section of the LCD module

18

E3

Input

Enable Signal for right section of the LCD module

19

NC

-

No Connection

20

NC

-

No Connection

Note:

*1.

Display or instruction data could write into the LCD module’s driver/controllers individually or at the same time.

*2.

Only read display or instruction data form one of the driver/controller in the LCD module at a time, otherwise

unexpected data collision will occur.