FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 254)

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CHAPTER 12 LCD CONTROLLER/DRIVER
■ Use of external voltage divider
Figure 12.2-6 "External voltage divider connection" shows an external voltage divider connection.
Figure 12.2-6 External voltage divider connection
Note:
To preclude the external voltage divider from being affected by the internal voltage divider, the LCD
drive supply voltage control bit of LCD control register (LCDR: VSEL) must be written to "0" to isolate
it from the entire internal voltage divider.
Reference:
The resistance of RX in the external voltage divider depends on the LCD used. Select an appropriate
value.
V3
V2
V1
VR
RX
RX
RX
N-ch
R
R
R
V 1
V 2
V 3
LCD enable
MB89950/950A series
V 1 to V 3 : Voltages at V1 to V3 pins.
Vcc