ST7556 Sitronix Technology, ST7556 Datasheet - Page 25

• Manufacturer Part Number: ST7556
• Description: 65 x 102 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7556
H=”1”
S/W initial internal register
The 1
The 2
System Bias
Select LCD bias ratio of the voltage required for driving the LCD.
LCD bias voltage
Symbol
VLCDIN
V1
V2
Ver 2.2
A0
A0
A0
0
0
0
BS
st
nd
0
0
0
0
1
1
1
1
Instruction
Instruction
2
WR(R/W)
WR(R/W)
WR(R/W)
0
0
0
BS
0
0
1
1
0
0
1
1
1
D7
D7
D7
0
0
0
Bias voltage for 1/8 bias
VLCDIN
7/8 X VLCDIN
6/8 X VLCDIN
BS
D6
D6
D6
0
1
0
1
0
1
0
1
0
0
0
0
D5
D5
D5
0
0
0
Bias
11
10
9
8
7
6
5
4
D4
D4
D4
0
1
1
25/43
Symbol
V3
V4
VSS
Recommend Duty
D3
D3
D3
1
0
0
1:10/1:9/1:8
1:65/1:68
1/40:1/34
1:18/1:16
1:100
1:80
1:48
1/24
BS
D2
D2
D2
1
0
2
BS
D1
D1
D1
1
1
1
Bias voltage for 1/8 bias
2/8 X VLCDIN
1/8 X VLCDIN
VSS
BS
D0
D0
D0
0
0
0
2005/10/05