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Sixteen Colors (Four Bits/Pixel in Color Mode)
When the S1D13503 has 4-bit color pixels, each pixel can index into each of the three color LUTs.
The LUT bank bits are ignored in this mode.
16-Level Color Mode
4-bit pixel data
Address
Red
00
00
01
00
02
00
03
00
04
0A
05
0A
06
0A
07
0A
S18A-G-002-02
Red Look-Up Table 16 x 4
0
1
2
3
C
D
E
F
Green Look-Up Table 16 x 4
0
1
2
3
C
D
E
F
Blue Look-Up Table 16 x 4
0
1
2
3
C
D
E
F
Figure 3-8 16-Level Color Mode Look-Up Table Architecture
Table 3-10 Simulation of First 16 Entries of Standard VGA Palette
Green
Blue
00
00
00
0A
0A
00
0A
0A
00
00
00
0A
0A
00
0A
0A
S1D13503 Programming Notes and Examples
4-bit 'RED' Look-Up Table data output
4-bit 'GREEN' Look-Up Table data output
4-bit 'BLUE' Look-Up Table data output
Address
Red
08
00
09
00
0A
00
0B
00
0C
0F
0D
0F
0E
0F
0F
0F
Green
Blue
00
00
00
0F
0F
00
0F
0F
00
00
00
0F
0F
00
0F
0F
2-19
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