CH7009A Datasheet, PDF (29/46 Pages) List of Unclassifed Manufacturers – Chrontel CH7009 DVI / TV Output Device

CHRONTEL
Black Level Register
Symbol:
Address:
Bits:
CH7009A
BL
07h
8
BIT:
7
6
5
4
3
2
1
0
SYMBOL:
BL7
BL6
BL5
BL4
BL3
BL2
BL1
BL0
TYPE:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
DEFAULT:
1
0
0
0
0
0
1
1
Register BL controls the black level. The luminance data is added to this black level, which must be set between 51
and 208. When the input data format is zero through three the default values are 131 for NTSC and PAL-M, 110 for
PAL and 102 for NTSC-J. When the input data format is four the default values are 112 for NTSC and PAL-M, 94
for PAL and 88 for NTSC-J.
Contrast Enhancement Register
Symbol:
CE
Address:
08h
Bits:
3
BIT:
7
6
5
4
3
2
1
0
SYMBOL:
CE2
CE1
CE0
TYPE:
R/W
R/W
R/W
DEFAULT:
0
1
1
Bits 2-0 of register CE control contrast enhancement feature of the CH7009, according to the figure below. A
setting of ‘0’ results in reduced contrast, a setting of ‘1’ leaves the image contrast unchanged, and values beyond ‘1’
result in increased contrast.
512
444
376
308
You<ti> _n
240
256
172
104
36
32
32
36
104
172
240
308
376
444
512
Yinn
Figure 15: Contrast Enhancement diagram
201-0000-035 Rev 1.1, 5/8/2000
29