AK8851 Datasheet, PDF (30/80 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

ASAHI KASEI
[AK8851]
(4) Color Saturation Control
Color Saturation adjustment is made by multiplying the Chroma signal (C) with a fixed value set by [Saturation Control
Register](R/W)[Sub Address 0x11]. The Saturation factor is performed on C signal. A result of multiplied Saturation factor
is U/V- modulated.
Adjustable range of Saturation multiplying factor is from 0 to 255/128 in 1/128 per step.
Default value of this register is an un-adjusted value of (0x80).
Bit allocation of [Saturation Control Register] is shown below.
Sub Address 0x11
bit 7
bit 6
SAT7
SAT6
1
0
bit 5
SAT5
0
bit 4
bit 3
SAT4
SAT3
Default Value
0
0
bit 2
SAT2
0
Default Value : 0x80
bit 1
bit 0
SAT1
SAT0
0
0
(5) HUE Control
The AK8851 can rotate HUE characteristics. Rotation of Hue is controlled by [Hue Control Register](R/W)[Sub Address
0x12].
Hue adjustment ranges from + 45 degrees to – 45 degrees in 0.35 per step.
Default value of this register is the un-adjusted value (0x80),set the value in 2’s complement number.
Bit allocation of [HUE Control Register] is as shown below.
Sub Address 0x12
bit 7
bit 6
bit 5
bit 4
bit 3
HUE7
HUE6
HUE5
HUE4
HUE3
Default Value
0
0
0
0
0
bit 2
HUE2
0
Default Value : 0x80
bit 1
bit 0
HUE1
HUE0
0
0
(6) SEPIA Color Output
This is a function to output the decoded result in sepia color, which is set by [SEPIA]-bit of [Image Control Register].
* [SEPIA]-bit:
This is to output the decoded result in sepia color.
[ SEPIA]-bit
function
0
Normal
1
Sepia color
Note
MS0244-E-03
30
Confidential
2005 / 07