A SERVICE OF

logo

Open as PDF
next previous
939
Chapter 47 LCD Controller
7.Q&A
7.9 How do I select internal or external divided resistors?
• When using internal divided resistors:
• When using external divided resistors:
The LCD driving voltage can be generated by connecting external divided resistors to the LCD drive power
supply pins (V0 to V3).
To avoid the effect of internal divided resistors, the resistors must be disconnected by setting “0” to the LCD
drive power supply control bit (LCR0.VSEL).
7.10 How do I use external divided resistors to shut off the current when LCD is
deactivated?
The V0 pin is internally connected to Vss (GND) via a transistor. For this reason, the current generated on
deactivating LCD controller can be shut off by connecting external divided resistors to the V0 pin on the Vss
side. To shut off the current, use the display mode select bit (MS[1:0]= “00”).
V3
V2
V1
V0
N-ch
R
R
R
V
3
V
2
V
1
V
0
LCDC operation
enabled
VR
RX
RX
RX
V3
V2
V1
V0
N-ch
R
R
R
V
3
V
2
V
1
V
0
LCDC operation
enabled