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CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
4.7.6 LCD contrast adjustment
When "Internal power supply (normal mode)" is selected by mask option for the LCD drive power,
software can adjust the LCD contrast.
It is realized by controlling the voltages V
The contrast can be adjusted to 16 levels as shown in Table 4.7.6.1. V
1.03 to 1.40 V, and other voltages change according to V
At initial reset, the LC0–LC3 are set to 0000B. The software should initialize the register to get the desired
contrast.
When an external power supply is selected by mask option, the LC0–LC3 register becomes invalid.
Furthermore, the contrast adjustment function cannot be used when "Internal power supply (low-power
mode)" is selected. Setting the above register is ignored.
In this case, the V
voltage is fixed at 0.98 V (Typ.).
C1
54
, V
C1
C2
Table 4.7.6.1 LCD contrast
No.
LC3
LC2
LC1
0
0
0
0
1
0
0
0
2
0
0
1
3
0
0
1
4
0
1
0
5
0
1
0
6
0
1
1
7
0
1
1
8
1
0
0
9
1
0
0
10
1
0
1
11
1
0
1
12
1
1
0
13
1
1
0
14
1
1
1
15
1
1
1
and V
output from the LCD system voltage circuit.
C3
is changed within the range from
C1
.
C1
LC0
V
(V)
Contrast
C1
0
1.03
1
1.06
0
1.09
1
1.12
0
1.15
1
1.18
0
1.20
1
1.23
0
1.26
1
1.28
0
1.30
1
1.32
0
1.34
1
1.36
0
1.38
1
1.40
EPSON
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S1C63656 TECHNICAL MANUAL
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