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參數資料
| 型號： | LC74799M |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDSO30 |
| 封裝： | 0.375 INCH, MFP-30 |
| 文件頁數： | 2/32頁 |
| 文件大小： | 322K |
| 代理商： | LC74799M |
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No. 5834-10/32
LC74799, 74799M
Second byte
Note: All registers are set to 0 when the LC74799/M is reset by the RST pin.
DA
Register
Contents
Notes
0 to 7
State
Function
7at
0
Character attribute off
1Character attribute on
6c6
0
1
5c5
0
1
4c4
0
1
3c3
0
1
2c2
0
1
1c1
0
1
0c0
0
1
Character code (00 to 7F hexadecimal)
Note: All registers are set to 0 when the LC74799/M is reset by the RST pin.
COMMAND2 (Vertical display start position and vertical character size setup command)
First byte
DA
Register
Contents
Notes
0 to 7
State
Function
7—
1
6—
0
5—
1
4—
0
3
VS21
0
1
2
VS20
0
1
VS11
0
1
0
VS10
0
1
Command 2 identification code.
Sets the vertical display start position and the vertical character size.
Second line vertical character size
First line vertical character size
Second byte
DA
Register
Contents
Notes
0 to 7
State
Function
7—
0Second byte identification bit
6FS
0Crystal oscillator frequency: 2fsc
1Crystal oscillator frequency: 4fsc
5
VP5
0
(MSB)
1
4
VP4
0
1
3
VP3
0
1
2
VP2
0
1
VP1
0
1
0
VP0
0
(LSB)
1
The vertical display start position is set by the 6
bits VP0 to VP5.
The weight of bit 1 is 2H.
If VS is the vertical display start position then:
5
VS = H ×
(2 ∑ 2n VPn)
n=0
H: the horizontal synchronization pulse period
Character
display area
01
0
1H/dot
2H/dot
1
3H/dot
1H/dot
VS21
VS20
01
0
1H/dot
2H/dot
1
3H/dot
1H/dot
VS11
VS10
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