LC74788 datasheet(13/23 Pages) SANYO

13 / 23 page

No. 5731-13/23

LC74788, 74788M, 74788JM

COMMAND4 (Display control setup command)

• First byte

Contents

Notes

0 to 7

State

Function

—

Command 4 identification code.

—

Display character data write setup.

—

TSTMOD

Normal operating mode

This bit must be set to 0.

Test mode

RAMERS

Erase display RAM. (The RAM data is set to FF hexadecimal.)

OSCSTP

Do not stop the crystal and LC oscillators.

Stop the crystal and LC oscillators.

SYSRST

Reset all registers and turn display off.

• Second byte

Contents

Notes

0 to 7

State

Function

—

Second byte identification bit

BLK2

Character display area

Specifies the size for complete fill in

Video display area

BLK1

Changes the blanking size

BLK0

BK1

Blinking period: About 0.5 s

Switches the blinking period

Blinking period: About 1.0 s

BK0

Blinking off

Blinking on

Reverse video off

Reverse video on

DSPON

Character display off

Character display on

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

Blinking in reverse video mode switches the display between

normal character display and reverse video display.

Erasing RAM takes about 500 µs. (This operation

must be executed in the DSPOFF state.)

Valid in external synchronization mode when

character display is off.

The registers are reset when the CS pin is low, and

the reset state is cleared when CS is set high.

BLK0

BLK1

Blanking off

Character size

Frame size

Complete fill in

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