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CHAPTER 16 LCD CONTROLLER/DRIVER
16.7 Supplying LCD Drive Voltage V
LC0
, V
LC1
, and V
LC2
The
µ
PD780973 Subseries have a split resistor to create an LCD drive voltage, and the drive voltage is fixed
to 1/3 bias.
To supply various LCD drive voltages, internal V
DD
or external V
LCD
supply voltage can be selected.
Table 16-5. LCD Drive Voltage
Bias Method
1/3 Bias Method
LCD Drive Voltage
V
LC0
V
LCD
V
LC1
2/3 V
LCD
V
LC2
1/3 V
LCD
Figure 16-8 shows an example of supplying an LCD drive voltage from an internal source according to Table
16-5. By using variable resistors r
1
and r
2
, a non-stepwise LCD drive voltage can be supplied.
Содержание mPD780973 Series
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