TOPWAY

LCD Module User Manual

LM3033CDW-0B

www.topwaysz.com

Document Name: LM3033CDW-0B-Manual-Rev0.1.DOC

Page: 11 of 13

4.5

Display Control Instructions

4.5.1 Basic Instruction Set

RE=0, basic instruction set

Code

Instructions

Function

CLEAR

0

0

0

0

0

0

0

0

0

1

Fill DDRAM with “20h”, and set DDRAM address

counter (AC) to “00h”

HOME

0

0

0

0

0

0

0

0

1

X

Set DDRAM address counter (AC) to “00h” and put

cursor to origin.

DDRAM content no changed.

ENTRY

MODE

0

0

0

0

0

0

0

1

I/D

S

Set cursor position and display shift when doing

write or read operation

I/D=1, cursor move right AC increased by 1

I/D=0, cursor move left, AC decreased by 1

S=1, toggle the shift of the entire display

(based on I/D defined direction)

DISPLAY

ON/OFF

0

0

0

0

0

0

1

D

C

B

D=1, display ON

D=0, display OFF

C=1, cursor ON

C=0, cursor OFF

B=1, blink ON

B=0, blink OFF

CURSOR

DISPLAY

CONTROL

0

0

0

0

0

1 S/C R/L X

X

Cursor position and display shift control.

DDRAM content no changed.

FUNCTION

SET

0

0

0

0

1

DL

X

RE

X

X

DL=1, 8bit interface

DL=0, 4bit interface

RE=1, extended instruction

RE=0; basic instruction

SET CGRAM

ADDR

0

0

0

1 AC5 AC4 AC3 AC2 AC1 AC0

Set CGRAM address to address counter (AC)

Make sure that in extended instruction SR=0 (scroll

or RAM address selected)

SET DDRAM

ADDR

0

0 AC7 AC6 AC5 AC4 AC3 AC2 AC1 AC0

Set DDRAM address to address counter (AC),

where AC7 =1, AC6=0

READ BF &

ADDR

0

1

BF AC6 AC5 AC4 AC3 AC2 AC1 AC0

Read busy flag (BF) for completion of the internal

operation, also read out the value of AC

WRITE RAM

1

0

D7 D6 D5 D4 D3 D2 D1 D0

Write data to internal RAM

(DDRAM, CGRAM,GDRAM)

For 16bit data, write two byte consecutively,

high byte first, then low byte

READ RAM

1

1

D7 D6 D5 D4 D3 D2 D1 D0

Read data from internal RAM

(DDRAM, CGRAM,GDRAM)

Note:

*1. For the details of the Display Control Instructions, please refer to Sitronix ST7920 series datasheet.

*2. RE is the selection byte of basic and extended instruction set. Each time altering the value of RE, it will remain. Thus, it is not

necessary to set RE every time when using the same group of instruction set