mc9s08lc60 Freescale Semiconductor, Inc, mc9s08lc60 Datasheet - Page 166
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mc9s08lc60
Manufacturer Part Number
mc9s08lc60
Description
Hcs08 Microcontrollers 8-bit Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08LC60.pdf
(360 pages)
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Chapter 9 Liquid Crystal Display Driver (S08LCDV1)
9.6.1.2
The voltage waveform across the “f” segment of the LCD (between BP1 and FP0) is illustrated in
Figure
be on.
9.6.1.3
The voltage waveform across the “e” segment of the LCD (between BP2 and FP0) is illustrated in
Figure
segment will be off.
9.6.2
Contrast control for the LCD module is achieved when LCD power supply is adjusted above and below
the LCD threshold voltage. The LCD threshold voltage is the nominal voltage required to energize the
LCD segments. For 3-V LCD glass, the LCD threshold voltage is 3-V; while, for 5-V LCD glass, the LCD
threshold voltage is 5-V. By increasing the value of the LCD threshold voltage, the energized segments on
the LCD glass will become more opaque. Decreasing the value of the LCD threshold voltage makes the
energized segments on the LCD glass become more transparent. The LCD power supply can be adjusted
to facilitate contrast control by using external components like a variable resistor.
circuits that could be used to implement contract control.
166
9-21. As shown in the waveform, the voltage level reaches the value V
9-22. As shown in the waveform, the voltage does not reach the voltage V
LCD Contrast Control
Segment On Driving Waveform
Segment Off Driving Waveform
BP1–FP0
BP2–FP0
MC9S08LC60 Series Data Sheet: Technical Data, Rev. 4
Figure 9-22. “e” Segment Voltage Waveform
Figure 9-21. “f” Segment Voltage Waveform
3
therefore the segment will
3
Figure 9-23
threshold therefore the
Freescale Semiconductor
+V
+V
+V
V
–V
–V
–V
+V
+V
+V
–V
–V
–V
V
0
0
3
2
1
1
2
3
3
2
1
1
2
3
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