BT848 ETC, BT848 Datasheet - Page 108

• Manufacturer Part Number: BT848
• Description: Single-Chip Video Capture for PCI
• Manufacturer: ETC

C
Luma Gain Register, Lower Byte
Luma Gain Register, Lower Byte
Memory Mapped Location 0x030 – (CONTRAST_LO)
Upon reset it is initialized to 0xD8. CONTRAST_LO(0) is the least significant bit.
98
Bits
ONTROL
[7:0]
R
EGISTER
Type
RW
CONTRAST
D
Default
0xD8
EFINITIONS
Name
CONTRAST_LO
The least significant byte of the luma gain (contrast) value.
Decimal Value
511
510
.
.
217
216
.
.
128
.
.
1
0
Description
The CON_L_MSB bit and the CONTRAST_LO register concate-
nate to form the 9-bit CONTRAST register. The value in this regis-
ter is multiplied by the luminance value to provide contrast
adjustment.
L848A_A
Hex Value
0x1FF
0x1FE
.
.
0x0D9
0x0D8*
.
.
0x080
.
.
0x001
0x000
% of Original Signal
236.57%
236.13%
.
.
100.46%
100.00%
.
.
59.26%
.
.
0.46%
0.00%
Single-Chip Video Capture for PCI
Bt848/848A/849A
Brooktree
®