
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
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 LC74785/M locks into the display
character data write mode, and another first byte cannot be written.
When the CS1 pin is set high, the LC74785/M is set to the COMMAND0 (display memory write address setup mode)
state.
No. 5520-10/24
LC74785, LC74785M
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
c6
c5
c4
c3
c2
c1
c0
Character write
COMMAND2
1
0
1
0
VS
0
FS
VP
Vertical character size and
21
20
11
10
5
4
3
2
1
0
vertical 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
0
HLF
NON
INT
0
BCL
CB
PH
Display control
TON
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
VNP
VSP
MSK
EGL
Display control
1
3
SEL
ERS
SEL
COMMAND8
1
0
1
SEL
MOD
0
LNA
LPA
Display control
2
1
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