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CHAPTER 18 LCD CONTROLLER/DRIVER
User’s Manual U15798EJ2V0UD
Figure 18-5. Relationship Between Reference Clock Generating Frame Frequency, and Frame Frequency
t
LCD
t
FLAME
Static
3-time division
4-time division
f
LCD
t
FLAME
t
FLAME
Remark
f
LCD
:
Reference clock that generates frame frequency
t
LCD
:
LCD clock period
t
FLAME
: Frame period
(3) LCD gain adjust register 0 (VLCG0)
This register controls the voltage boost level during the voltage boost operation.
VLCG0 is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets the value of this register to 00H.
Figure 18-6. Format of LCD Gain Adjust Register 0 (VLCG0)
Symbol
7
6
5
4
3
2
1
0
Address
After reset
R/W
VLCG0
0
0
0
0
0
0
0
GAIN
FF94H
00H
R/W
GAIN
Reference voltage (V
LCD2
) level selection
Note
0
1.0 V (specification of the LCD panel used is 3 V)
1
1.5 V (specification of the LCD panel used is 4.5 V)
Note
Select the settings according to the specifications of the LCD panel that is used.
Caution Before changing the VLCG0 setting, be sure to stop voltage boosting (VLCON = 0).
Remark
The TYP. value is indicated as the reference voltage (V
LCD2
) value.