Internal Split Resistors Of Lcd Controller/Driver; Fig. 14.2 Equivalent Circuit For Internal Split Resistors - Fujitsu MB90420/5 (A) Series Hardware Manual

MB90420/5 (A) SERIES F

14.2.1 Internal Split Resistors of LCD Controller/Driver

The power supply voltage for the LCD driver is generated by using external split resistors connected to the
V0 to V3 pins or by using internal split resistors.
„
Internal split resistors of LCD controller/driver
The LCD controller/driver has internal split resistors. Also, external split resistors can be connected to the
LCD driving power pins (V0 to V3).
Internal or external split resistors are selected using the LCDC control register driving power control bit
(LCRL: VSEL). When the VSEL bit is set to 1, the internal split resistors have current. Consequently, when
using the internal split resistors, set the VSEL bit to 1 and do not connect external split resistors.
Enabling of the LCD controller is inactive when the LCD operation stops (LCRL: MS1, MS0 = 00
Figure 14.2 shows an equivalent circuit for internal split resistors.
VSEL
V to V
0
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
V
3
V
2
V
1
V
0
: Voltages of V0 to V3 pins
3

Fig. 14.2 Equivalent Circuit for Internal Split Resistors

R
Pch
Nch
R
Pch
Nch
R
Pch
Nch
LCD
Nch
controller
enabled
14-6
).
B
V
CC
V
3
V
2
V
1
V
0