ADV7180
Data Sheet
CCAP
CC_EVEN_FIELD, Address 0x78[1], User Sub Map,
Read Only
Two bytes of decoded closed caption data are available in the
I2C registers. The field information of the decoded CCAP data
can be obtained from the CC_EVEN_FIELD bit (Register 0x78).
Identifies the field from which the CCAP data was decoded.
When CC_EVEN_FIELD is 0, closed captioning was detected
from an odd field.
CC_CLEAR, Closed Caption Clear, Address 0x78[0],
User Sub Map, Write Only, Self-Clearing
When CC_EVEN_FIELD is 1, closed captioning was detected
from an even field.
Setting CC_CLEAR to 1 reinitializes the CCAP readback
registers.
VDP_CCAP_DATA_0, Address 0x79[7:0], User Sub Map,
Read Only
CC_AVL, Closed Caption Available, Address 0x78[0],
User Sub Map, Read Only
Decoded Byte 1 of CCAP data.
When CC_AVL is 0, closed captioning was not detected.
When CC_AVL is 1, closed captioning was detected.
VDP_CCAP_DATA_1, Address 0x7A[7:0], User Sub Map,
Read Only
Decoded Byte 2 of CCAP data.
10.5 ± 0.25µs
12.91µs
7 CYCLES
OF 0.5035MHz
(CLOCK RUN-IN)
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
S
T
A
R
T
P
A
R
I
T
Y
P
A
R
I
T
Y
50 IRE
40 IRE
VDP_CCAP_D ATA_0 VDP_CCAP_D ATA_1
REFERENCE COLOR BURST
(9 CYCLES)
FREQUENCY = f = 3.579545MHz
SC
AMPLITUDE = 40 IRE
10.003µs
27.382µs
33.764µs
Figure 48. CCAP Waveform and Decoded Data Correlation
Table 82. CCAP Readback Registers1
Signal Name
Register Location
Address (User Sub Map)
CCAP_BYTE_1[7:0]
CCAP_BYTE_2[7:0]
VDP_CCAP_DATA_0[7:0]
VDP_CCAP_DATA_1[7:0]
121
122
0x79
0x7A
1 These registers are readback registers; default value does not apply.
Rev. G | Page 64 of 120
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