sed1374 ETC-unknow, sed1374 Datasheet - Page 118

• Manufacturer Part Number: sed1374
• Description: Sed1374 Embedded Memory Color Lcd Controller
• Manufacturer: ETC-unknow

Page 22
SED1374
X26A-G-002-02
Table 4-8: Suggested LUT Values to Simulate VGA Default 256 Color Palette
8 Bpp Color
When the SED1374 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 SED1374 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 SED1374
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
0F
00
01
02
03
04
05
06
07
08
...
Red
0B
0D
00
02
04
06
09
0F
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: 99/04/27