参数资料
型号: M38227ECHP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80
封装: 12 X 12 MM, 0.50 MM PITCH, PLASTIC, QFP-80
文件页数: 33/82页
文件大小: 1168K
代理商: M38227ECHP
36
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
Bias Control and Applied Voltage to LCD
Power Input Pins
To the LCD power input pins (VL1–VL3), apply the voltage shown
in Table 12 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 (COM0–COM3) 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. 34 Example of circuit at each bias
Table 13 Duty ratio control and common pins used
Duty
ratio
Common pins used
Notes1: COM2 and COM3 are open.
2: COM3 is open.
Bit 1
Bit 0
COM0, COM1 (Note 1)
Duty ratio selection bit
2
3
4
0
1
0
1
COM0–COM2 (Note 2)
COM0–COM3
Table 12 Bias control and applied voltage to VL1–VL3
Bias value
1/3 bias
Voltage value
VL3=VLCD
VL2=2/3 VLCD
VL1=1/3 VLCD
Note 1: V LCD is the maximum value of supplied voltage for the
LCD panel.
1/2 bias
VL3=VLCD
VL2=VL1=1/2 VLCD
Contrast control
1/2 bias
1/3 bias
Contrast control
VL3
R4
R5
R4 = R5
R1
R2
R3
R1 = R2 = R3
VL2
VL1
VL3
VL2
VL1
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