Rainbow-electronics Atmega169L Manual de usuario Pagina 212

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ATmega169V/L
2514AAVR08/02
Figure 98. Driving a LCD with One Common Terminal
1/2Dutyand1/2Bias For LCD with two common terminals (1/2 duty) a more complex waveform must be used
to individually control segments. Although 1/3 bias can be selected 1/2 bias is most
common for these displays. Waveform is shown in Figure 99. SEG0 - COM0 is the volt-
age across a segment that is on, and SEG0 - COM1 is the voltage across a segment
that is off.
Figure 99. Driving a LCD with Two Common Terminals
V
LCD
GND
V
LCD
GND
V
LCD
GND
-V
LCD
SEG0
COM0
SEG0 - COM0
Frame Frame
V
LCD
GND
V
LCD
GND
GND
SEG1
COM0
SEG1 - COM0
Frame Frame
V
LCD
GND
V
LCD
1
/
2
V
LCD
GND
V
LCD
1
/
2
V
LCD
GND
-1
/
2
V
LCD
-V
LCD
SEG0
COM0
SEG0 - COM0
Frame Frame
V
LCD
GND
V
LCD
1
/
2
V
LCD
GND
V
LCD
1
/
2
V
LCD
GND
-1
/
2
V
LCD
-V
LCD
SEG0
COM1
SEG0 - COM1
Frame Frame
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