
May 1997
57
DATA BOOK v1.5
PROGRAMMING INTERFACE
CL-PS7110
Low-Power System-on-a-Chip
word), similarly one bit per pixel means only the lower two nibbles are valid D[7:0] in the least-significant
word). The pixel-to-grayscale level assignments are shown in
Table 3-14
and
Table 3-15
.
PALMSW Most-Significant Word-LCD Palette Register
See PALLSW description in
Section 3.2.27
.
The actual physical color and pixel duty ratio for the grayscale values is shown in
Table 3-16
. Note that
colors 8–15 are the inverse of colors 7–0 respectively; this means that colors 7 and 8 are identical. The
steps in the grayscale are nonlinear but have been chosen to give a close approximation to perceived lin-
ear grayscales. The is due to the eye being more sensitive to changes in gray level close to 50% gray.
Table 3-14. Least-Significant Word Palette Assignments
31:28
27:24
23:20
19:16
15:12
11:8
7:4
3:0
Grayscale
value for
pixel value 7
Grayscale
value for
pixel value 6
Grayscale
value for
pixel value 5
Grayscale
value for
pixel value 4
Grayscale
value for
pixel value 3
Grayscale
value for
pixel value 2
Grayscale
value for
pixel value 1
Grayscale
value for
pixel value 0
Table 3-15. Most-Significant Word Palette Assignments
31:28
27:24
23:20
19:16
15:12
11:8
7:4
3:0
Grayscale
value for
pixel value
15
Grayscale
value for
pixel value
14
Grayscale
value for
pixel value
13
Grayscale
value for
pixel value
12
Grayscale
value for
pixel value
11
Grayscale
value for
pixel value
10
Grayscale
value for
pixel value 9
Grayscale
value for
pixel value 8
Table 3-16. Grayscale Value to Color Mapping
Grayscale
Value
Duty Cycle
% Pixels
Lit
% Step
change
0
0
0%
11.1%
1
1/9
11.1%
8.9%
2
1/5
20.0%
6.7%
3
4/15
26.7%
6.6%
4
3/9
33.3%
6.7%
5
2/5
40.0%
5.4%
6
4/9
44.4%
5.6%
7
1/2
50.0%
0.0%
8
1/2
50.0%
5.6%
9
5/9
55.6%
5.4%
10
3/5
60.0%
6.7%
11
6/9
66.7%
6.6%