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4.7.6 LCD contrast adjustment
In the S1C63558, the LCD contrast can be adjusted by the software.
It is realized by controlling the voltages V
circuit. When these voltages are supplied to the externally expanded LCD driver, the expanded LCD
contrast is adjusted at the same time.
The contrast can be adjusted to 16 levels as shown in Table 4.7.6.1.
Setting the LC3–LC0 register affects the V
a result, the LCD contrast is adjusted.
The supply voltage V
DD
V (when V
= 2.5 to 5.5 V) in the highest-contrast setting (No. 15 in Table 4.7.6.1), note, however, that
DD
V
will be V
- 0.1 V when V
C23
DD
At room temperature, use setting number 7 or 8 as standard.
Since the contents of LC0–LC3 are undefined at initial reset, initialize it by the software.
S1C63558 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
, V
C1
C23
Table 4.7.6.1 LCD contrast
No.
LC3
LC2
0
0
0
1
0
0
2
0
0
3
0
0
4
0
1
5
0
1
6
0
1
7
0
1
8
1
0
9
1
0
10
1
0
11
1
0
12
1
1
13
1
1
14
1
1
15
1
1
voltage, and other voltages change according to the V
C23
within the range from 2.2 to 2.5 V affects the V
= 2.2 to 2.5 V.
DD
, V
and V
output from the LCD system voltage
C4
C5
LC1
LC0
Contrast
0
0
light
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
dark
EPSON
voltage. Ordinarily, V
C23
. As
C23
is 2.4
C23
53
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