參數(shù)資料
型號: M3822
廠商: Mitsubishi Electric Corporation
英文描述: Single Chip 8 Bits Microcomputer(8位單片機)
中文描述: 單芯片8位單片機(8位單片機)
文件頁數(shù): 31/52頁
文件大?。?/td> 781K
代理商: M3822
31
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3822 Group
Bias Control and Applied Voltage to LCD
Power Input Pins
To the LCD power input pins (V
L1
–V
L3
), apply the voltage shown in
Table 3 according to the bias value.
Select a bias value by the bias control bit (bit 2 of the LCD mode
register).
Common Pin and Duty Ratio Control
The common pins (COM
0
–COM
3
) to be used are determined by
duty ratio.
Select duty ratio by the duty ratio selection bits (bits 0 and 1 of the
LCD mode register).
Fig. 24 Example of circuit at each bias
Table 3. Bias control and applied voltage to V
L1
–V
L3
Bias value
1/3 bias
1/2 bias
Voltage value
V
L3
=V
LCD
V
L2
=2/3 V
LCD
V
L1
=1/3 V
LCD
V
L3
=V
LCD
V
L2
=V
L1
=1/2 V
LCD
Note 1
: V
LCD
is the maximum value of supplied voltage for the
LCD panel.
Table 4. Duty ratio control and common pins used
Duty
ratio
2
3
4
Common pins used
Notes 1 :
COM
2
and COM
3
are open
2 :
COM
3
is open
Bit 1
0
1
1
Bit 0
1
0
1
COM
0
, COM
1
(Note 1)
COM
0
–COM
2
(Note 2)
COM
0
–COM
3
Duty ratio selection bit
V
L3
V
L2
V
L1
R4
R5
R4 = R5
Contrast control
1/2 bias
V
L3
V
L2
V
L1
Contrast control
R1
R2
R3
R1 = R2 = R3
1/3 bias
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