LC74789M View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
MFG CO.
LC74789M Datasheet PDF : 23 Pages
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LC74789, 74789M, 74789JM
COMMAND4 (Display control setup command)
• First byte
DA
Register
0 to 7
State
Contents
Function
7
—
1
6
—
1 Command 4 identification code
5
—
0 Display character data write setup
4
—
0
0 Normal operating mode
3 TSTMOD
1 Test mode
0
2 RAMERS
1 Erase display RAM. (The RAM data is set to FF hexadecimal.)
0 Do not stop the crystal and LC oscillators.
1 OSCSTP
1 Stop the crystal and LC oscillators.
0
0
SYSRST
1 Reset all registers and turn display off.
Notes
This bit must be set to 0.
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.
• Second byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
BLK2
BLK1
BLK0
BK1
BK0
RV
DSPON
Contents
State
Function
0 Second byte identification bit
0 Character display area
1 Video display area
0
1
BLK1
BLK0
0
0
1
1
0
Blanking off
Frame size
0 Blinking period: About 0.5 s
1 Blinking period: About 1.0 s
0 Blinking off
1 Blinking on
0 Reverse video off
1 Reverse video on
0 Character display off
1 Character display on
1
Character size
Complete fill in
Note: All registers are set to 0 when the LC74789/M/JM is reset by the RST pin.
Notes
Specifies the size for complete fill in
Changes the blanking size
Switches the blinking period
Blinking in reverse video mode switches the display between
normal character display and reverse video display.
No. 5732-13/23
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