Epson S1D13705 User Manual

Page 113

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

...

indicates unused entries