sed1355 ETC-unknow, sed1355 Datasheet - Page 175

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Epson Research and Development
Vancouver Design Center
Programming Notes and Examples
Issue Date: 99/04/27
Index
0C
0D
1C
1D
0A
0B
0E
0F
1A
1B
1E
1F
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
A0
A0
A0
A0
A0
B0
C0
E0
00
00
00
00
50
50
50
50
F0
F0
F0
F0
00
10
20
20
30
40
50
60
70
80
90
F0
R
C0
A0
A0
A0
F0
F0
F0
F0
A0
B0
E0
F0
00
00
00
00
50
50
50
50
50
00
10
20
20
30
40
50
60
70
80
90
G
Table 4-5: Suggested LUT Values to Simulate VGA Default 256 Color Palette
8 bpp color
When the SED1355 is configured for 8 bpp color mode all 256 entries in the LUT are used. Each
byte in display buffer corresponds to one pixel and is used as an index value into the LUT.
The SED1355 LUT has four bits (16 intensities) of intensity control per primary color while a
standard VGA RAMDAC has six bits (64 intensities). This four to one difference has to be
considered when attempting to match colors between a VGA RAMDAC and the SED1355 LUT.
(i.e. VGA levels 0 - 3 map to LUT level 0, VGA levels 4 - 7 map to LUT level 1...). Additionally,
the significant bits of the color tables are located at different offsets within their respective bytes.
After calculating the equivalent intensity value the result must be shifted into the correct bit
positions.
The following table shows LUT values that will approximate the VGA default color palette.
A0
A0
A0
A0
A0
B0
C0
E0
00
00
00
00
50
F0
50
F0
50
F0
50
F0
00
10
20
20
30
40
50
60
70
80
90
F0
B
Index
4A
4B
4C
4D
4E
5A
5B
5C
5D
5E
40
41
42
43
44
45
46
47
48
49
4F
50
51
52
53
54
55
56
57
58
59
5F
D0
C0
D0
D0
C0
F0
F0
F0
F0
F0
B0
B0
E0
F0
F0
F0
F0
F0
F0
F0
F0
F0
E0
90
70
70
70
70
70
70
70
70
R
B0
D0
D0
B0
B0
B0
B0
B0
B0
B0
B0
B0
B0
C0
D0
E0
70
90
F0
F0
F0
F0
F0
F0
F0
F0
F0
90
F0
F0
F0
F0
G
B0
D0
E0
D0
C0
B0
B0
B0
B0
B0
B0
B0
B0
70
70
70
70
70
70
70
70
70
90
F0
F0
F0
F0
F0
F0
F0
F0
F0
B
Index
8C
8D
9C
9D
8A
8B
8E
8F
9A
9B
9E
9F
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
30
40
50
60
70
70
70
70
70
70
70
70
70
60
50
40
30
30
30
30
30
30
30
30
50
50
60
60
70
70
70
70
R
30
30
30
30
30
30
30
30
30
40
50
60
70
70
70
70
70
70
70
70
70
60
50
40
50
50
50
50
50
50
50
50
G
70
60
30
30
30
30
70
70
70
60
60
50
70
70
70
70
50
40
30
30
30
30
30
40
50
60
70
70
70
70
70
70
B
Index
CC
CD
DC
DD
CA
CB
CE
CF
DA
DB
DE
DF
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
00
00
00
00
00
00
00
00
20
20
30
30
40
40
40
40
40
40
40
40
40
30
30
20
20
20
20
20
20
20
20
20
R
40
40
40
40
40
30
20
10
20
20
20
20
20
20
20
20
20
20
30
30
40
40
40
40
40
40
40
40
40
30
30
20
G
X23A-G-003-05
SED1355
00
10
20
30
40
40
40
40
40
40
40
40
40
30
30
20
20
20
20
20
20
20
20
20
20
20
30
30
40
40
40
40
B
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