AK8850 Datasheet, PDF (47/99 Pages) Asahi Kasei Microsystems – NTSC Digital Video Decoder

ASAHI KASEI
[AK8850]
7-4-6 ACC ( Auto Color Control )
This function adjusts the Color Burst level of the C-signal input to its appropriate level, which is 40 IRE ( with NTSC
Composite ,Y/C input ). The adjustable range is from –12 dB to + 12 dB. The ACC processing can be turned on or off by
the [ CONTROL 2 REGISTER ]. Its function is valid for Composite and Y/C inputs ( invalid for Component input ).
ACC Control Register Description :
ACC is controlled by [ CONTROL 2 REGISTER ].
* [ CONTROL 2 REGISTER ]
bit 7
bit 6
CLKMODE1
CLKMODE0
bit 5
ACC1
1
1
0
bit 4
bit 3
ACC0
DPCC1
Default Value
0
0
Enable/Disable and the Constant ( T ) of the ACC are set as follows.
[ACC1:ACC0](bit-5:bit-4)
ACC Function
[0,0]
Disable (Default)
[0,1]
T=2-Field
[1,0]
T=8-Field
[1,1]
T=30-Field
The ACC and the Color Saturation adjustments function independently.
bit 2
DPCC0
0
bit 1
DPCT1
0
bit 0
DPCT0
1
Rev.0
47
2003/01