ADV7180WBSTZ datasheet(64/120 Pages) AD

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ADV7180

Data Sheet

Rev. G | Page 64 of 120

CCAP

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).

CC_CLEAR, Closed Caption Clear, Address 0x78[0],

User Sub Map, Write Only, Self-Clearing

Setting CC_CLEAR to 1 reinitializes the CCAP readback

registers.

CC_AVL, Closed Caption Available, Address 0x78[0],

User Sub Map, Read Only

When CC_AVL is 0, closed captioning was not detected.

When CC_AVL is 1, closed captioning was detected.

CC_EVEN_FIELD, Address 0x78[1], User Sub Map,

Read Only

Identifies the field from which the CCAP data was decoded.

When CC_EVEN_FIELD is 0, closed captioning was detected

from an odd field.

When CC_EVEN_FIELD is 1, closed captioning was detected

from an even field.

VDP_CCAP_DATA_0, Address 0x79[7:0], User Sub Map,

Read Only

Decoded Byte 1 of CCAP data.

VDP_CCAP_DATA_1, Address 0x7A[7:0], User Sub Map,

Read Only

Decoded Byte 2 of CCAP data.

REFERENCE COLOR BURST

(9 CYCLES)

FREQUENCY = fSC = 3.579545MHz

AMPLITUDE = 40 IRE

7 CYCLES

OF 0.5035MHz

(CLOCK RUN-IN)

2 3 4 5 6 7 0 1 2 3 4 5 6 7

VDP_CCAP_D ATA_0

33.764µs

10.003µs

10.5 ± 0.25µs

12.91µs

27.382µs

50 IRE

40 IRE

VDP_CCAP_D ATA_1

Figure 48. CCAP Waveform and Decoded Data Correlation

Table 82. CCAP Readback Registers1

Signal Name

Address (User Sub Map)

CCAP_BYTE_1[7:0]

VDP_CCAP_DATA_0[7:0]

121

0x79

CCAP_BYTE_2[7:0]

VDP_CCAP_DATA_1[7:0]

122

0x7A

These registers are readback registers; default value does not apply.

ADV7180WBSTZ Datasheet(PDF) 64 Page - Analog Devices

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