Samsung S3C2440A User Manual
Page 389
S3C2440A RISC MICROPROCESSOR
LCD CONTROLLER
15-21
256 PALETTE USAGE (TFT)
Palette Configuration and Format Control
The S3C2440A provides 256 color palette for TFT LCD Control.
The user can select 256 colors from the 64K colors in these two formats.
The 256 color palette consists of the 256 (depth) x 16-bit SPSRAM. The palette supports 5:6:5 (R:G:B) format and
5:5:5:1(R:G:B:I) format.
When the user uses 5:5:5:1 format, the intensity data(I) is used as a common LSB bit of each RGB data. So,
5:5:5:1 format is the same as R(5+I):G(5+I):B(5+I) format.
In 5:5:5:1 format, for example, the user can write the palette as in Table 15-5 and then connect VD pin to TFT LCD
panel(R(5+I)=VD[23:19]+VD[18], VD[10] or VD[2], G(5+I)=VD[15:11]+ VD[18], VD[10] or VD[2], B(5+I)=VD[7:3]+
VD[18], VD[10] or VD[2].), and set FRM565 of LCDCON5 register to 0.
Table 15-4. 5:6:5 Format
INDEX\Bit Pos.
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Address
00H
R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B4
B3
B2 B1 B0
1)
0X4D000400
01H
R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B4
B3
B2 B1 B0 0X4D000404
.......
.......
FFH
R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B4
B3
B2 B1 B0 0X4D0007FC
Number of VD
23 22
21 20 19 15
14
13
12
11
10
7
6
5 4 3
Table 15-5. 5:5:5:1 Format
INDEX\Bit Pos.
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Address
00H
R4 R3 R2 R1 R0 G4 G3 G2 G1 G0 B4
B3
B2
B1 B0 I 0X4D000400
01H
R4 R3 R2 R1 R0 G4 G3 G2 G1 G0 B4
B3
B2
B1 B0 I 0X4D000404
.......
.......
FFH
R4 R3 R2 R1 R0 G4 G3 G2 G1 G0 B4
B3
B2
B1 B0 I 0X4D0007FC
Number of VD
23
22
21
20
19
15
14
13
12
11
7
6
5
4
3
2)
Notes
1. 0x4D000400 is Palette start address.
2. VD18, VD10 and VD2 have the same output value, I.
3. DATA[31:16] is invalid.
Palette Read/Write
When the user performs Read/Write operation on the palette, HSTATUS and VSTATUS of LCDCON5 register
must be checked, for Read/Write operation is prohibited during the ACTIVE status of HSTATUS and VSTATUS.
Temporary Palette Configuration
The S3C2440A allows the user to fill a frame with one color without complex modification to fill the one color to the
frame buffer or palette. The one colored frame can be displayed by the writing a value of the color which is
displayed on LCD panel to TPALVAL of TPAL register and enable TPALEN.