Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual page 549

(2) 2-bpp (4-color) mode
Use the first four entries of each look-up table. Select 4-color data from among the 4,096 colors, and write it
to the respective entries. The RGB data in entry 0 is output for pixel data "00", and the RGB data in entry 3 is
output for pixel data "11".
"00"
"01"
2-bit pixel data
"10"
"11"
Table 2.10 shows an example of the basic data setting.
Table 2.10 Example of Look-up-Table Settings in 2-bpp (4-Color) Mode
Index
4–15
S1C33L03 FUNCTION PART
Index
0 4-bit R data for pixel data "00"
1 4-bit R data for pixel data "01"
2 4-bit R data for pixel data "10"
3 4-bit R data for pixel data "11"
4
:
15
Index
0 4-bit G data for pixel data "00"
1 4-bit G data for pixel data "01"
2 4-bit G data for pixel data "10"
3 4-bit G data for pixel data "11"
4
:
15
Index
0 4-bit B data for pixel data "00"
1 4-bit B data for pixel data "01"
2 4-bit B data for pixel data "10"
3 4-bit B data for pixel data "11"
4
:
15
Figure 2.13 Look-up Table in 2-bpp (4-Color) Mode
R look-up table
0 0
1 7
2 0xA
3 0xF
0
EPSON
VII LCD CONTROLLER BLOCK: LCD CONTROLLER
Red look-up table
Unused
Green look-up table
Unused
Blue look-up table
Unused
G look-up table B look-up table
0
7
0xA
0xF
0
4-bit R display data
4-bit G display data
4-bit B display data
0
7
0xA
0xF
0
B-VII-2-15
A-1
B-VII
LCDC