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ADV7180W - VBI Data: VDP content-Based Data Update; for certain standards such as WSS, CGMS, PDC etc....... the available bit shows the availability of that standard only when its content has changed. Is this as well possible for closed captioning?

For CGMS, the available bit is always 1 when CGMS data is present, CGMS data has changed, CGMS data has not changed and CGMS is enabled.

For Closed Captioning the available bit is 1 when closed captioning is enabled, when closed caption data is detected (changed and not changed).

For VBI System 2, CCAPD bit is 1 when closed caption data is detected.