參數(shù)資料
型號(hào): 3820
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機(jī)
文件頁數(shù): 33/66頁
文件大?。?/td> 1093K
代理商: 3820
33
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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. 25 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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