參數(shù)資料
型號: M38227M8A-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 5 MHz, MICROCONTROLLER, PQFP80
封裝: 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件頁數(shù): 29/61頁
文件大?。?/td> 841K
代理商: M38227M8A-XXXHP
Rev.1.20
Dec 24, 2003
page 33 of 57
3822 Group (A ver.)
Bias Control and Applied Voltage to LCD
Power Input Pins
To the LCD power input pins (VL1–VL3), apply the voltage shown
in Table 9 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. 31 Example of circuit at each bias
Table 10 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 9 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: VLCD 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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