No. 5731-12/23

LC74788, 74788M, 74788JM

COMMAND3 (Horizontal display start position and horizontal size setup command)

• First byte

DA

Register

Contents

Notes

0 to 7

State

Function

7

—

1

6

—

0

Command 3 identification code

5

—

1

Sets the horizontal display start position and the horizontal character size.

4

—

1

3

HS21

0

1

Second line horizontal character size

2

HS20

0

1

1

HS11

0

1

First line horizontal character size

0

HS10

0

1

HS20

0

1

HS21

0

1 Tc/dot

2 Tc/dot

1

3 Tc/dot

1 Tc/dot

• Second byte

DA

Register

Contents

Notes

0 to 7

State

Function

7

—

0

Second byte identification bit

6

LC

0

Use the LC oscillator for the dot clock

1

Use the crystal oscillator for the dot clock

5

HP5

0

If HS is the horizontal start position then:

(MSB)

1

HS =Tc

4

HP4

0

Tc: Period of the oscillator connected to OSCIN/OSCOUT in operating

1

mode.

3

HP3

0

1

2

HP2

0

1

1

HP1

0

1

0

HP0

0

(LSB)

1

Note: All registers are set to 0 when the LC74788/M/JM is reset by the RST pin.

5

n=0

HS10

0

1

HS11

0

1 Tc/dot

2 Tc/dot

1

3 Tc/dot

1 Tc/dot

The horizontal display start position is set by the 6

bits HP0 to HP5.

The weight of bit 1 is 2Tc.

Selects the dot clock used for character display in the

horizontal direction.