ADV7180
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.
0—Closed captioning was detected on an odd field.
1—Closed captioning was detected on an even field.
CC_CLEAR, Closed Caption Clear, Address 0x78 [0],
User Sub Map, Write Only, Self-Clearing
VDP_CCAP_DATA_0, Address 0x79 [7:0], User Sub Map,
Read Only
1—Reinitializes the CCAP readback registers.
CC_AVL, Closed Caption Available, Address 0x78 [0],
User Sub Map, Read Only
Decoded Byte 1 of CCAP data.
VDP_CCAP_DATA_1, Address 0x7A [7:0], User Sub Map,
Read Only
0—Closed captioning was not detected.
1—Closed captioning was detected.
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 45. CCAP Waveform and Decoded Data Correlation
Table 78. CCAP Readback Registers1
Signal Name
Register Location
VDP_CCAP_DATA_0[7:0]
VDP_CCAP_DATA_1[7:0]
Address (User Sub Map)
CCAP_BYTE_1[7:0]
CCAP_BYTE_2[7:0]
121
122
0x79
0x7A
1 The register is a readback register; default value does not apply.
Rev. A | Page 61 of 112
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