CL-PS7111-VC-A View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CL-PS7111-VC-A Datasheet PDF : 105 Pages
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CL-PS7111
Low-Power System-on-a-Chip
5.24 Least-Significant Word-LCD Palette Register — PALLSW
31:28
27:24
23:20
19:16
15:12
11:8
7:4
3:0
Grayscale Grayscale Grayscale Grayscale Grayscale Grayscale Grayscale Grayscale
value for pixel value for pixel value for pixel value for pixel value for pixel value for pixel value for pixel value for pixel
value 7
value 6
value 5
value 4
value 3
value 2
value 1
value 0
The least- and most-significant Word-LCD Palette registers make up a 64-bit read/write register, which
maps the logical pixel value to a physical grayscale level. The 64-bit register is made up of 16 × 4-bit nib-
bles, each nibble defines the grayscale level associated with the appropriate pixel value. If the LCD con-
troller is operating in two bits per pixel, only the lower four nibbles are valid (D[15:0] in the least-significant
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 the respective bit description table.
5.25 Most-Significant Word-LCD Palette Register — PALMSW
Refer to the description of PALLSW.
31:28
27:24
23:20
19:16
15:12
11:8
7:4
3:0
Grayscale Grayscale Grayscale Grayscale Grayscale Grayscale Grayscale Grayscale
value for pixel value for pixel value for pixel value for pixel value for pixel value for pixel value for pixel value for pixel
value 15
value 14
value 13
value 12
value 11
value 10
value 9
value 8
The actual physical color and pixel duty ratio for the grayscale values are shown in Table 5-5. 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
linear grayscales. The is due to the eye being more sensitive to changes in gray level close to 50% gray.
Table 5-5. Grayscale Value-to-Color
Mapping
Table 5-5. Grayscale Value-to-Color
Mapping (cont.)
Grayscale Duty % Pixels % Step
Value Cycle
Lit
Change
Grayscale Duty % Pixels % Step
Value Cycle
Lit
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%
12
11/15 73.3%
6.7%
13
4/5
80.0%
8.9%
14
8/9
88.9%
11.1%
15
1
100%
–
68
REGISTER DESCRIPTIONS
September 1997
PRELIMINARY DATA BOOK v2.0
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