TOPWAY

LCD Module User Manual

LM2068R-3

www.topwaysz.com

Document Name: LM2068R-3-Manual-Rev0.1.DOC

Page: 8 of 12

4.4

Control Data and Command

The LCD module setting is controlled by the internal Register Values.

The Register Address and Register Value should be issued in sequence and they are addressed

as Control Data.

A full command sequence should be as follow.

Steps

/RD

/WR

RS

Data (DB0~ DB7)

1

st

1

0

0

Register Address

2

nd

1

0

0

Register Value

4.5

Register Table Summary

Reg.

Add

Reg.

Name

R/W

Descriptions

00h

WLCR

R/W

PW1~PW0 : Power Mode

11=Normal Mode; 00=Off Mode

SR : Software Reset

1=reset all register (except DDRAM); 0=normal operation

CG : Display mode selection

1=Character Mode; 0=Graphic Mode

DP : Display on off control

1=normal display; 0=display off

BK : Full screen blinking control

1=blinking (blink time is set by CBTR); 0=normal;

DV : Full screen inverse control

1=normal; 0=inversed

01h

MISC

R/W

CKN : Clock output Control (not applicable)

1=enable; 0=disable

PLR : Interrupt and Busy Polarity (not applicable)

1=active High; 0=active low

CKB1~CKB0 : Clock Speed Selection

00=3MHz; 01=4MHz; 10=8MHz; 11=12MHz

02h

APSR

R/W

SP1~SP0 : ROM/RAM reading speed

00=speed0; 01=speed1; 10=speed2; 11=speed3

ORA : Font ROM Readable

1=enable; 0=disable

SRFS : Scrolling Reset for Start

1=enable; 0=disable

03h

ADSR

R/W

DADR : Display RAM Order (byte)

1=reverse; 0=normal

AUCM : Common Auto Scrolling

1=enable; 0=disable

AUSG : Segment Auto Scrolling

1=enable; 0=disable

Common or Segment Scrolling Selection

1=Segment Scrolling; 0=Common Scrolling

10h

WCCR

R/W

ARI : Auto-increase Cursor Position (in reading DDRAM operation)

1=enable; 0=disable

ALG : Chinese/English char alignment

1=enable; 0=disable

WDI : Store Current Data to DDRAM

1=directly; 0=invertly

WBC : Set Bold font (char mode only)

1=bold; 0=normal

AIX : Auto-increase Cursor Position (in writing DDRAM operation)

1=enable; 0=disable

CP : Cursor display control

1=on; 0=off

CK : Cursor blink control

1=blinking; 0=no blinking

CSD : Set cursor width

1=auto adjust, 0=fix width

11h

DWLR

R/W

CR3~CR0 : Cursor Height

DY3~DY0 : Line Distance