NEC PD78F9488 User Manual
Page 256
CHAPTER 13 LCD CONTROLLER/DRIVER
256
User’s Manual U15331EJ4V1UD
(3) LCD voltage boost control register 0 (LCDVA0)
LCDVA0 controls the voltage boost level during the voltage boost operation.
LCDVA0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets LCDVA0 to 00H.
Figure 13-5. Format of LCD Voltage Boost Control Register 0
0
GAIN
LCDVA0
Symbol
Address
After reset
R/W
FFB3H
00H
R/W
7
6
5
4
3
2
1
<0>
GAIN
0
1
1.5 V (specification of the LCD panel used is 4.5 V.)
1.0 V (specification of the LCD panel used is 3 V.)
0
0
0
0
0
0
Reference voltage (V
LC2
) level selection
Note
Note Select the settings according to the specifications of the LCD panel that is used.
Caution Before changing the LCDVA0 setting, be sure to stop voltage boosting (VAON0 = 0).
Remark The TYP. value is indicated as the reference voltage (VLC2) value.