Fusion 878A
5.0 Control Register Definitions-Function 0
PCI Video Decoder
5.3 Local Registers (Memory Mapped)
100600B
Conexant
5-13
0x028—Brightness Control Register (BRIGHT)
Upon reset this register is initialized to 0x00.
Bits
Type
Default
Name
Description
[7:0]
RW
0x00
BRIGHT
The brightness control involves the addition of a two’s complement
number to the luma channel. Brightness can be adjusted in 255
steps, from –128 to +127. The resolution of brightness change is 1
LSB (0.39% with respect to the full luma range).
Table 5-1. BRIGHT Parameters
Hex Value
Binary Value
Brightness Changed By
Number of
LSBs
Percent of
Full Scale
0x80
1000 0000
–128
–50 %
0x81
1000 0001
–127
–49.6 %
.
.
.
.
.
.
0xFF
1111 1111
–01
–0.39 %
0x00
(1)
0000 0000
00
0 %
0x01
0000 0001
+01
+0.39 %
.
.
.
.
.
.
0x7E
0111 1110
+126
+49.2 %
0x7F
0111 1111
+127
+49.6 %
NOTE(S):
(1)
Default Option.