External Split Resistors For Lcd Controller/Driver; Fig. 14.5 External Split Resistor Connection Example; Table 14-2 Lcd Driving Voltage Setting - Fujitsu MB90420/5 (A) Series Hardware Manual

MB90420/5 (A) SERIES F

14.2.2 External Split Resistors for LCD Controller/Driver

The LCD driving voltage is generated by using external split resistors or internal split resistors. Brightness
can be adjusted by connecting a variable resistor between Vcc and V3 pins.
„
External split resistors for LCD controller/driver
External split resistor can be used by connection to the LCD driving power pins (V0 to V3).
Figure 14.5 and Table 14-2 shows the external split resistor connection and LCD driving voltage for each
bias type.
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
V
CC
VR
V
3
R
V
2
V
1
R
V
0
V = V
0
1/2 bias

Fig. 14.5 External Split Resistor Connection Example

Table 14-2 LCD Driving Voltage Setting

1/2 bias
1/3 bias
V to V : Voltages of V0 and V3 pins
0 3
V : LCD Operating voltage
LCD
V
LCD
SS
1/3 bias
V3 V2
V 1/2V
LCD LCD
V 2/3V
LCD LCD
14-8
V
CC
VR
V
3
R
V
2
R
V
1
R
V
0
V = V
0 SS
V1 V0
1/2V V
LCD SS
1/3V V
LCD SS
V
LCD