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Epson Research and Development Page 19
Vancouver Design Center
Programming Notes and Examples S1D13705
Issue Date: 02/01/22 X27A-G-002-03
4 bpp color
When the S1D13705 is configured for 4 bpp color mode, the displayed colors are selected
from the first sixteen entries of the Look-Up Table. The LUT entries may be set to any of
the 4096 possible colors.
Each byte in the display buffer contains two adjacent pixels. If a nibble has a value of
“0000” then the color in LUT index 0 is displayed. A nibble value of “0001” results in the
color in LUT index 1 being displayed. The pattern continues to the nibble pattern of “1111”
which results in the sixteenth color of the Look-Up Table being displayed.
The following table shows the example values for 4 bit-per-pixel display mode. These
colors simulate the colors used by the sixteen color modes of a VGA.
Table 4-3: Suggested LUT Values to Simulate VGA Default 16 Color Palette
Index Red Green Blue
00 00 00 00
01 00 00 A0
02 00 A0 00
03 00 A0 A0
04 A0 00 00
05 A0 00 A0
06 A0 A0 00
07 A0 A0 A0
08 00 00 00
09 00 00 F0
0A 00 F0 00
0B 00 F0 F0
0C F0 00 00
0D F0 00 F0
0E F0 F0 00
0F F0 F0 F0
10 00 00 00
... 00 00 00
FF 00 00 00
indicates unused entries