Second byte
Note: All registers are set to 0 when the LC74770M is reset by the RST pin.
6
COMMAND 5 (System 2 output control and line size setting command)
First byte
Second byte
Note: All registers are set to 0 when the LC74770M is reset by the RST pin.
No. 4248-9/11
LC74770M
Register content
DA0 to DA7
Register name
State
Function
Note
7
—
0
Second byte identification bit
6
MD1
0
The blank output also outputs character data.
Blank output control
1
The blank output only outputs blank data.
5
MD0
0
The system 1 output outputs all lines.
Output system 1 control
1
The system 1 output only outputs lines not output by system 2.
4
EG
0
Border off
1
Border on
3
BK1
0
Blinking period set to about 0.5 second.
Blinking period switching
1
Blinking period set to about 1 second.
0
Blinking off
Blinking of reverse video characters
consists of alternation between normal
and reverse video.
2
BK0
1
Blinking on
1
RV
0
Reverse video off
1
Reverse video on
0
DSP
0
Character display off
(DSPON)
1
Character display on
Register content
DA0 to DA7
Register name
State
Function
Note
7
—
1
Command 5 identification code
Controls output system 2 and sets the line size.
(Output control for CHA2 and BLK2)
(Line size control)
6
—
1
5
—
0
4
—
1
3
—
0
2
—
0
1
—
0
0
LS
0
Output line selection
The line is selected in the second byte.
1
Character size selection (line units)
Register content
DA0 to DA7
Register name
State
Function
Note
7
—
0
Second byte identification bit
6
—
0
5
LN6
0
The sixth line of data is not output to CHA2 and BLK2.
1
The sixth line of data is output to CHA2 and BLK2.
4
LN5
0
The fifth line of data is not output to CHA2 and BLK2.
1
The fifth line of data is output to CHA2 and BLK2.
3
LN4
0
The fourth line of data is not output to CHA2 and BLK2.
1
The fourth line of data is output to CHA2 and BLK2.
2
LN3
0
The third line of data is not output to CHA2 and BLK2.
1
The third line of data is output to CHA2 and BLK2.
1
LN2
0
The second line of data is not output to CHA2 and BLK2.
1
The second line of data is output to CHA2 and BLK2.
0
LN1
0
The first line of data is not output to CHA2 and BLK2.
1
The first line of data is output to CHA2 and BLK2.
Used for the line output setting when LS
is low.
Used for the line size setting when LS is
high.
Note:
LS = 1: Set the line size.
LS = 0: Specifies line output.