參數(shù)資料
型號(hào)： LC74775
元件分類： 畫面疊加
英文描述： ON-SCREEN DISPLAY IC, PDIP30
封裝： SDIP-30
文件頁(yè)數(shù)： 4/35頁(yè)
文件大小： 258K
代理商： LC74775
No. 5919-12/35
LC74775, 74775M
DA 0 to 7
Register
Contents
Notes
State
Function
7
–
1
6
–
0
Command 3 identification code.
5
–
1
Horizontal display start position and the horizontal
4
–
1
character size setup.
3
HS21
0
1
Second line horizontal character size
2
HS20
0
1
HS11
0
1
First line horizontal character size
0
HS10
0
1
First byte
VS20
0
1
VS21
0
1Tc/dot
2Tc/dot
1
3Tc/dot
1Tc/dot
VS10
0
1
VS11
0
1Tc/dot
2Tc/dot
1
3Tc/dot
1Tc/dot
COMMAND3 (Horizontal display start position and horizontal size setup command)
DA 0 to 7
Register
Contents
Notes
State
Function
7
–
0
Second byte identification bit
6
LC
0
Use the LC oscillator as the dot clock
Selects the dot clock used for character
1
Use the crystal oscillator as the dot clock
display in the horizontal direction.
5
HP5
0
(MSB)
1
4
HP4
0
1
3
HP3
0
The horizontal display start position is set
1
by the 6 bits HP0 to HP5.
2
HP2
0
The weight of bit 1 is 2Tc.
1
HP1
0
1
0
HP0
0
(LSB)
1
Second byte
Note: All registers are set to 0 when the LC74775/M is reset by the RST pin.
If HS is the horizontal start position then:
HS = Tc
×
Tc: Period of the oscillator connected to OSCIN/OSCOUT
in operating mode.
2
∑ 2 HPn
5
n
n=0
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