S1D13704 Epson Electronics America, Inc., S1D13704 Datasheet - Page 118

• Manufacturer Part Number: S1D13704
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Page 22
S1D13704
X26A-G-002-03
Table 4-8: Suggested LUT Values to Simulate VGA Default 256 Color Palette
8 Bpp Color
When the S1D13704 is configured for 8 bit-per-pixel color mode, 8 colors from red and
green and 4 colors from the blue active banks are displayed. The eight red, eight green and
four blue entries can be set to any color.
The S1D13704 LUT has four bits (16 levels) of intensity control per primary color while a
standard VGA RAMDAC has six bits (64 levels). This four to one difference has to be
considered when attempting to match colors between a VGA RAMDAC and the S1D13704
LUT. (i.e. VGA levels 0 - 3 map to LUT level 0, VGA levels 4 - 7 map to LUT level 1...
etc.).
The following table shows LUT values that approximate the default 256 color VGA palette.
Index
00
01
02
03
04
05
06
07
08
0F
...
Red
0B
0D
0F
00
02
04
06
09
00
00
00
Normally unused entries
Green
0B
0D
00
02
04
06
09
0F
00
00
00
Blue
0A
0F
00
05
00
00
00
00
00
00
00
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 01/02/12