AK8856VN Datasheet, PDF (35/98 Pages) Asahi Kasei Microsystems – NTSC/PAL Video Decoder

ASAHI KASEI
[AK8856VN]
Reading Closed Caption data :
Write a “1” to the CCRQ-bit of Request VBI Info Register (W) [Sub Address 0x0A]. When a “1” is written to
this bit, the AK8856 is placed in a wait condition for Closed Caption Data decoding. Then when data arrives,
it is decoded and a “1” is written back to the CCDET-bit of the Status Register (R / W) [Sub Address 0x10].
After reset, the CCDET-bit is “1” (it goes to “0” when a “1” is written to the CCRQ-bit ). The decoded data is
written into the Closed Caption 1 Register (R) [Sub Address 0x12] and the Closed Caption 2 Register
(R) [Sub Address 0x13]. Data in the Closed Caption 1 Register and Closed Caption 2 Register are
retained until they are over-written with new data.
Configuration of Closed Caption 1 Register and Closed Caption 2 Register:
Closed Caption 1 Register (R) [Sub Address 0x12]
Sub Address 0x12
bit 7
bit 6
bit 5
bit 4
CC7
CC6
CC5
CC4
bit 3
CC3
bit 2
CC2
bit 1
CC1
bit 0
CC0
Closed Caption 2 Register (R) [Sub Address 0x13]
Sub Address 0x13
bit 7
bit 6
bit 5
bit 4
CC15
CC14
CC13
CC12
bit 3
CC11
bit 2
CC10
bit 1
CC9
bit 0
CC8
Reading out Closed Caption Extended Data :
Write a “1” to the EXTRQ-bit of the Request VBI Info Register ( W ) [ Sub Address 0x0A ]. When a “1” is
written to this bit, the AK8856 is placed in a wait condition for Extended Data decoding. Then when data
arrives, it is decoded and a “1” is written to the EXTDET-bit of the Status Register (R / W) [ Sub Address
0x10].
After reset, the EXTDET-bit is “1” (it goes to “0” when a “1” is written to the EXTRQ-bit). The decoded data is
written into the Extended Data 1 Register (R) [Sub Address 0x14] and the Extended Data 2 Register (R)
[Sub Address ox15]. Data in the Extended Data 1 Register and Extended Data 2 Register are retained
until they are over-written with new data.
Configuration of Extended Data 1 Register and Extended Data 2 Register:
Extended Data 1 Register (R) [Sub Address 0x14]
Sub Address 0x14
bit 7
bit 6
bit 5
bit 4
EXT7
EXT6
EXT5
EXT4
bit 3
EXT3
bit 2
EXT2
bit 1
EXT1
bit 0
EXT0
Extended Data 2 Register (R) [Sub Address 0x15]
Sub Address 0x15
bit 7
bit 6
bit 5
bit 4
EXT15
EXT14
EXT13
EXT12
bit 3
EXT11
bit 2
EXT10
bit 1
EXT9
bit 0
EXT8
MS0522-E-00
35
2006/Dec