BT848 ETC, BT848 Datasheet - Page 111

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

Bt848/848A/849A
Single-Chip Video Capture for PCI
Hue Control Register
Memory Mapped Location 0x03C – (HUE)
Upon reset it is initialized to 0x00. HUE(0) is the least significant bit. An asterisk indicates the default option.
Brooktree
Bits
[7:0]
Type
®
RW
Default
0x00
HUE
Name
HUE
Hex Value
0x80
0x81
.
.
0xFF
0x00*
0x01
.
.
0x7E
0x7F
L848A_A
Description
Hue adjustment involves the addition of a two’s complement num-
ber to the demodulating subcarrier phase. Hue can be adjusted in
256 steps in the range –90˚ to +89.3˚, in increments of 0.7˚.
Binary Value
1000 0000
1000 0001
.
.
1111 1111
0000 0000*
0000 0001
.
.
0111 1110
0111 1111
Subcarrier
Reference
Changed By
–90˚
–89.3˚
.
.
–0.7˚
00˚
+0.7˚
.
.
+88.6˚
+89.3˚
C
ONTROL
R
EGISTER
Resulting Hue
Changed By
+90˚
+89.3˚
.
.
+0.7˚
00˚
–0.7˚
.
.
–88.6˚
–89.3˚
Hue Control Register
D
EFINITIONS
101