CHAPTER 3 LCD CONTROLLER/DRIVER
User’s Manual U18438EJ2V0UD
25
(4) LCD voltage boost control register 0 (VLCG0)
VLCG0 controls the voltage boost level during the voltage boost operation.
VLCG0 is set with an 8-bit memory manipulation instruction.
Reset signal generation sets VLCG0 to 00H.
Figure 3-8. Format of LCD Voltage Boost Control Register 0
Address: LCDCTL's 03H
After reset:
00H R/W
Symbol
7 6 5 4 3 2 1 0
VLCG0
CTSEL1
CTSEL0
0 0 0 0 0
GAIN
GAIN
Reference voltage (V
LC2
) level selection
Note1
0
1.5 V (specification of the LCD panel used is 4.5 V.)
1
1.0 V (specification of the LCD panel used is 3 V.)
Contrast adjustment
(TYP.)
V
LC0
V
LC1
V
LC2
CTSEL1 CTSEL0
GAIN = 0
GAIN = 1
GAIN = 0
GAIN = 1
GAIN = 0
GAIN = 1
1 0
4.89 V
Note2
3.39 V
3.27 V
Note2
2.27 V
1.63 V
Note2
1.13 V
1
1
4.71 V
3.21 V
3.13 V
2.13 V
1.57 V
1.07 V
0
0
4.50 V
3.00 V
3.00 V
2.00 V
1.50 V
1.00 V
0
1
4.29 V
2.79 V
2.87 V
1.87 V
1.43 V
0.93 V
Notes 1.
Select the settings according to the specifications of the LCD panel that is used.
2.
Operating voltage range: 2.0 V
≤
LV
DD
< 5.5 V
Cautions 1. Bits 1 to 5 must be set to 0.
2. Before changing the VLCG0 setting, be sure to stop voltage boosting (VLCON = 0).
3. When using the resistance division method, voltage boosting must be stopped (VLCON
= 0).