Display Control Command Table

Once written, the command identification code in the first byte is stored until the next first byte is written. However,

when the display character data write command (COMMAND1) is written, the LC74770M locks into the display

character data write mode, and another first byte cannot be written.

When a high level is input to the CS pin, the LC74770M is set to COMMAND0 (display memory write address setup

mode).

1

COMMAND 0 (Display memory write address setup command)

First byte

No. 4248-5/11

LC74770M

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

COMMAND 0

1

0

0

0

V3

V2

V1

V0

0

0

0

H4

H3

H2

H1

H0

Write address

COMMAND 1

1

0

0

1

0

0

0

0

at

c6

c5

c4

c3

c2

c1

c0

Character write

COMMAND 2

1

0

1

0

0

0

0

0

0

0

VP

VP

VP

VP

VP

VP

Vertical display position

5

4

3

2

1

0

start position

COMMAND 3

1

0

1

1

0

0

0

0

0

0

HP

HP

HP

HP

HP

HP

Horizontal display position

5

4

3

2

1

0

start position

COMMAND 4

1

1

0

0

TST

RCL

OSC

RST

0

MD1

MD0

EG

BK

BK

RV

DSP

Display control

1

0

COMMAND 5

1

1

0

1

0

0

0

LS

0

0

LN

LN

LN

LN

LN

LN

BLK2 and CHA2 output control:

6

5

4

3

2

1

lines 1 to 6, and line size control

COMMAND 6

BLK2 and CHA2 output control:

1

1

1

0

P3

P2

P1

P0

0

0

LN

LN

LN

LN

LN

LN

lines 7 to 12, and general-purpose

12

11

10

9

8

7

port control

Register content

DA0 to DA7

Register name

State

Function

Note

7

—

1

6

—

0

Command 0 identification code

5

—

0

Sets the display memory write address.

4

—

0

3

V3

0

1

2

V2

0

1

Display memory address (0 to B hexadecimal)

1

V1

0

1

0

V0

0

1