參數(shù)資料
型號(hào): M38257E8GP
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁(yè)數(shù): 39/73頁(yè)
文件大?。?/td> 1323K
代理商: M38257E8GP
Rev.2.02
Jun 19, 2007
page 42 of 73
REJ03B0146-0202
3823 Group
Bias Control and Applied Voltage to LCD
Power Input Pins
To the LCD power input pins (VL1–VL3), apply the voltage shown
in Table 11 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. 38 Example of circuit at each bias
Table 12 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 11 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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