LC74794 データシートの表示（PDF） - SANYO -> Panasonic
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コンポーネント説明
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LC74794 Datasheet PDF : 30 Pages
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LC74794, 74794M
Second byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
at
c6
c5
c4
c3
c2
c1
c0
State
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Character attribute off
Character attribute on
Contents
Function
Character code (00 to 7F hexadecimal)
Note: All registers are set to 0 when the LC74794/M is reset by the RST pin.
Notes
COMMAND2 (Vertical display start position and vertical character size setup command)
First byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
—
—
—
VS21
VS20
VS11
VS10
State
1
0
1
0
0
1
0
1
0
1
0
1
Contents
Function
Command 2 identification code
Sets the vertical display start position and the vertical character size
VS21 VS20
0
1
VS10
VS11
0
1
0
1H/dot
3H/dot
0
1H/dot
3H/dot
1
2H/dot
1H/dot
1
2H/dot
1H/dot
Notes
Second line vertical character size
First line vertical character size
Second byte
DA
0 to 7
7
6
5
4
3
2
1
0
Register
—
FS
VP5
(MSB)
VP4
VP3
VP2
VP1
VP0
(LSB)
State
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Contents
Function
Second byte identification bit
Crystal oscillator frequency: 2fsc
Crystal oscillator frequency: 4fsc
If VS is the vertical display start position then:
5
VS
=
H
×
(2
n
Σ 2n
=0
VPn)
H: the horizontal synchronization pulse period
Notes
The vertical display start position is set by the
6 bits VP0 to VP5.
The weight of bit 1 is 2H.
No. 5557-10/30
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