Display Control Commands

Display control commands are input in an 8-bit serial format. Commands consist of a command identification code in the

first byte and data in the second and following bytes. The following commands are supported.

1

COMMAND0: Display memory (VRAM) write address setting command

2

COMMAND1: Display character data write command

3

COMMAND2: Vertical display start position and character size (lines 1 and 2) setting command

4

COMMAND3: Horizontal display start position and character size (lines 9 and 11) setting command

5

COMMAND4: Display control setting command 1

6

COMMAND5: Display control setting command 2

7

COMMAND6: Display control setting command 3

8

COMMAND7: Display control setting command 4

Display Control Command Table

First byte

Second byte

Command

Command identification code

Data

Data

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

COMMAND0

1

0

0

0

V3

V2

V1

V0

0

0

0

H4

H3

H2

H1

H0

Write address

COMMAND1

1

0

0

1

0

0

at2

at1

0

c6

c5

c4

c3

c2

c1

c0

Character write

COMMAND2

1

0

1

0

SZ

SZ

SZ

SZ

0

0

VP

VP

VP

VP

VP

VP

Vertical display start position

21

20

11

10

5

4

3

2

1

0

COMMAND3

1

0

1

1

SZ

SZ

SZ

SZ

0

0

HP

HP

HP

HP

HP

HP

Horizontal display start position

B1

B0

91

90

5

4

3

2

1

0

COMMAND4

1

1

0

0

RST

RAM

OSC

RND

0

I/N

BLK

BLK

BK

ATS

0

DSP

Display control 1

1

0

1

COMMAND5

1

1

0

1

PH

PH

PH

I/E

0

TST

CHAL

BLK

RSL

RSL

0

0

Display control 2

2

1

0

1

0

COMMAND6

1

1

1

0

MOD

MOD

MOD

MOD

0

0

0

0

IOS

BCL

BCL

CB

Display control 3

3

2

1

0

1

0

COMMAND7

1

1

1

1

0

0

0

LINS

0

0

LIN

LIN

LIN

LIN

LIN

LIN

Display control 4

5

4

3

2

1

0

Once the command identification code in the first bite is written, it is stored internally until the first byte of the following

command is written. However, when the display character data write command (COMMAND1) is written, the system

becomes locked in display character data write mode, and the first byte cannot be overwritten.

When the CS pin is set high the command state is set to COMMAND0, i.e., display memory write address setting mode.

1

COMMAND0: Display Memory Write Address Setting Mode

First data byte

Register content

DA0 to DA7

Register name

State

Function

Note

7

—

1

6

—

0

The command 0 identification code:

5

—

0

sets the display memory write address.

4

—

0

3

V3

0

1

2

V2

0

1

Display memory line address (from 0 to B (hexadecimal))

1

V1

0

1

0

V0

0

1

No. 4453-6/14

LC74760, 74760M