Display Control Commands
Display control commands have an 8-bit format and are transferred using the serial input function. Commands consist of
a command identification code in the first byte and command data in the following bytes. The following commands are
supported.
1
COMMAND0:
Display memory (VRAM) write address setup command
2
COMMAND1:
Display character data write command
3
COMMAND2:
Vertical display start position and vertical character size setup command
4
COMMAND3:
Horizontal display start position and horizontal character size setup command
5
COMMAND4:
Display control setup command
6
COMMAND5:
Display control setup command
7
COMMAND6:
Synchronizing signal detection setup command
8
COMMAND7:
Display control setup command
9
COMMAND8:
Display control setup command
10 COMMAND9:
Display control setup command
11 COMMAND10: Display control setup command
Once written, a first byte command identification code is stored until the next first byte is written. However, when the
display character data write command (COMMAND1) is written, the LC74788/M/JM locks into the display character
data write mode, and another first byte cannot be written.
When the CS pin is set high, the LC74788/M/JM is set to the COMMAND0 (display memory write address setup mode)
state.
No. 5731-8/23
LC74788, 74788M, 74788JM
Display Control Command Table
First byte
Second byte
Command
Command identification code
Data
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
COMMAND0
1
0
V3
V2
V1
V0
0
H4
H3
H2
H1
H0
Write address setup
COMMAND1
1
0
1
0
at
c7
c6
c5
c4
c3
c2
c1
c0
Character write
COMMAND2
1
0
1
0
VS
0
FS
VP
Vertical character size and vertical
21
20
11
10
5
4
3
2
1
0
display start position
COMMAND3
1
0
1
HS
0
LC
HP
Horizontal character size and
21
20
11
10
5
4
3
2
1
0
horizontal display start position
COMMAND4
1
0
TST
RAM
OSC
SYS
0
BLK
BK
RV
DSP
Display control
MOD
ERS
STP
RST
2
1
0
1
0
ON
COMMAND5
1
0
1
NP
NON
INT
0
NP
HLF
BCL
CB
PH
Display control
1
0
2
INT
2
1
0
COMMAND6
1
0
SEL
MOD
DIS
MUT
0
RN
SN
Synchronizing signal detection
0
LIN
2
1
0
3
2
1
0
COMMAND7
1
0
SEL
CTL
0
CIN
VNP
VSP
MSK
EGL
Display control
1
3
SEL
CTL
SEL
ERS
SEL
COMMAND8
1
0
1
VSY
HSY
0
LNA
LPA
Display control
SEL
3
2
1
0
2
1
0
COMMAND9
1
0
LNB
MOD
0
LNB
LPB
Display control
SEL
2
3
2
1
0
2
1
0
COMMAND10
1
LNC
MOD
0
LNC
LPC
Display control
SEL
3
2
1
0
2
1
0