Samsung S3C2451X User Manual page 560

LCD CONTROLLER
PALETTE USAGE
Palette Configuration and Format Control
The LCD controller can support the 256 colors palette for various selection of color mapping.
The user can select 256 colors from the 24-bit colors through these four formats.
256 colors palette consist of the 256(depth) × 25-bit DPSRAM. Palette supports 8:8:8, 6:6:6, 5:6:5(R:G:B), and etc
format.
For example of A:5:5:5 format, write palette like Table 22-3 and then connect VD pin to LCD
panel( R(5)=VD[23:19], G(5)=VD[15:11], and B(5)=VD[7:3] ). Select Alpha value in Window 1 Alpha Value
Register. At the last, Set Window Palette Control(W0PAL, case window0) register to 0'b101.
INDEX\ 24 23 22
Bit Pos.
00H AEN R7 R6
01H AEN R7 R6
....... ... ... ...
FFH AEN R7 R6
- 23 22
Number
of VD
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
22-20
Specifications and information herein are subject to change without notice.
Table 22-1. 25BPP(A:8:8:8) Palette Data Format
21 20 19 18 17 16
R5 R4 R3 R2 R1 R0
R5 R4 R3 R2 R1 R0
... ... ... ... ... ...
R5 R4 R3 R2 R1 R0
21 20 19 18 17 16
15 14 13 12 11 10
G7 G6 G5 G4 G3 G2
G7 G6 G5 G4 G3 G2
... ... ... ... ... ...
G7 G6 G5 G4 G3 G2
15 14 13 12 11 10
S3C2451X RISC MICROPROCESSOR
9 8 7 6 5 4
G1 G0 B7 B6 B5 B4
G1 G0 B7 B6 B5 B4
... ... ... ... ... ...
G1 G0 B7 B6 B5 B4
9 8 7 6 5 4
3 2 1 0
B3 B2 B1 B0
B3 B2 B1 B0
... ... ... ...
B3 B2 B1 B0
3 2 1 0