參數(shù)資料
型號: MC80C52EXXX-25/883:D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40
封裝: 0.600 INCH, SIDE BRAZED, DIP-40
文件頁數(shù): 57/141頁
文件大?。?/td> 7628K
234
8021G–AVR–03/11
ATmega329P/3290P
Figure 23-4. Driving a LCD with Two Common Terminals
23.3.3
1/3 Duty and 1/3 Bias
1/3 bias is usually recommended for LCD with three common terminals (1/3 duty). Waveform is
shown in Figure 23-5. SEG0 - COM0 is the voltage across a segment that is on and SEG0-
COM1 is the voltage across a segment that is off.
Figure 23-5. Driving a LCD with Three Common Terminals
23.3.4
1/4 Duty and 1/3 Bias
1/3 bias is optimal for LCD displays with four common terminals (1/4 duty). Waveform is shown
in Figure 23-6. SEG0 - COM0 is the voltage across a segment that is on and SEG0 - COM1 is
the voltage across a segment that is off.
VLCD
GND
VLCD
1/
2VLCD
GND
VLCD
1/
2VLCD
GND
-1/
2VLCD
-VLCD
SEG0
COM0
SEG0 - COM0
Frame
VLCD
GND
VLCD
1/
2VLCD
GND
VLCD
1/
2VLCD
GND
-1/
2VLCD
-VLCD
SEG0
COM1
SEG0 - COM1
Frame
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
-1/3VLCD
-2/3VLCD
-VLCD
SEG0
COM0
SEG0 - COM0
Frame
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
-1/3VLCD
-2/3VLCD
-VLCD
SEG0
COM1
SEG0 - COM1
Frame
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