SED1354 Datasheet, PDF (161/472 Pages) Epson Company – Color Graphics LCD/CRT Controller

Epson Research and Development
Vancouver Design Center
Page 21
2 bpp Gray Shade
In 2 bpp gray shade mode, the 16 LUT entries are divided into four separate banks, each having four
entries:
Table 3-14: Recommended LUT Values for 2 bpp Gray Shades
Index
(hex)
00
01
02
03
Look-Up Table
Data
(hex)
00
05
0A
0F
4 bpp Gray Shade
In 4 bpp gray shade mode, the pixel value indexes into one of 16 LUT entries. The LUT bank bits
are ignored in this mode. The recommendation for this mode is to program the register values to data
values equalling the register number (i.e. G[0] = 0, G[1]=1, G[2]=2, ... G[F]=0Fh).
8 bpp Gray Shade
When the SED1354 is configured for 8 bpp gray shade mode, bits [7:5] are ignored, bits [4:2]
represent the green LUT index, and bits [1:0] are ignored. Only 3 bits of the 8 that actually represent
any shade value, therefore the maximum gray shade combination is 8 shades. If this limitation is
deemed appropriate for your application, it is recommended that the LUTs are programmed
according to the following format: Red and Blue LUT entries are not important, Green LUT indexes
0-7 should be programmed 0-F as in the table below:
Table 3-15: Recommended LUT Values for 8 bpp Gray Shade
LUT Address
00
01
02
03
04
05
06
07
Green LUT Data
00
02
04
06
08
0A
0C
0F
This recommended LUT assumes that you are using only bank 0.
Programming Notes and Examples
Issue Date: 98/10/28
SED1354
X19A-G-002-06