EA DIP203-4

Page 3

ELECTRONIC ASSEMBLY reserves

the right to change specifications

without prior notice. Printing and

typographical

errors

reserved.

CONTRAST ADJUSTMENT

Pin 3 requires driving voltage for contrast

VEE. Adjustment can be done by external

potentiometer for example. The capacitor

is for a better startup behaviour.

Note: In contrast to many other

dotmatrix lcd modules input is

supplied with VDD level here !

CREATING YOUR OWN CHARACTERS

All these character display modules got the feature to create 8 own characters (ASCII Codes 0..7) in

addition to the 240 ROM fixed codes.

1.) The command "CG RAM Address Set"

defines the ASCII code (Bit 3,4,5) and the

dot line (Bit 0,1,2) of the new character.

Example demonstrates creating ASCII

code $00.

2.) Doing 8 times the write command "Data

Write" defines line by line the new

character. 8th. byte stands for the cursor

line.

3.) The newly defined character can be used as a "normal" ASCII code (0..7); use with "DD RAM

Address Set" and "Data Write".

Set CG RAM Address

Data

Adresse

Hex

Bit

Hex

7 6 5 4 3 2 1 0

01 000

000

$40

XXX

0 0 1 0 0

$04

001

$41

0 0 1 0 0

$04

010

$42

0 0 1 0 0

$04

011

$43

0 0 1 0 0

$04

100

$44

1 0 1 0 1

$15

101

$45

0 1 1 1 0

$0E

110

$46

0 0 1 0 0

$04

111

$47

0 0 0 0 0

$00

Addressing:

1st. line

$00..$13

2nd. line

$20..$33

3rd. line

$40..$53

4th. line

$60..$73

CHARACTER SET

A full character set is built-in already.

Additionally to that 8 more characters can

be defined individually.

INITIALISATION EXAMPLE FOR 8 BIT MODE

Command

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Hex

Description

Function Set

0

0

0

0

1

1

0

1

0

0

$34 8 bit data length, extension bit RE=1

ext. Function Set

0

0

0

0

0

0

1

0

0

1

$09 4 line mode

Function Set

0

0

0

0

1

1

0

0

0

0

$30 8 bit data length, extension bit RE=0

Display ON/OFF

0

0

0

0

0

0

1

1

1

1

$0F display on, cursor on, cursor blink

Clear Display

0

0

0

0

0

0

0

0

0

1

$01 clear display, cursor 1st. row, 1st. line

Entry Mode Set

0

0

0

0

0

0

0

1

1

0

$06 cursor will be automatically incremented

All versions do have a built-in temperature

compensation; so there's no more need

for contrast adjustment during operation

anymore.

2,5kW

2,5kW

VEE

VDD

+

10µF