Datasheet

2−45
2.20.55 Interrupt Status Register A
Address C0h
Default 00h
7 6 5 4 3 2 1 0
Lock state interrupt Lock interrupt Reserved FIFO threshold interrupt Line interrupt Data interrupt
The interrupt status register A can be polled by the host processor to determine the source of an interrupt. After an
interrupt condition is set it can be reset by writing to this register with a 1 in the appropriate bit(s).
Lock state interrupt:
0 = TVP5150A is not locked to the video signal (default).
1 = TVP5150A is locked to the video signal.
Lock interrupt:
0 = A transition has not occurred on the lock signal (default).
1 = A transition has occurred on the lock signal.
FIFO threshold interrupt:
0 = The amount of data in the FIFO has not yet crossed the threshold programmed at address C8h (default).
1 = The amount of data in the FIFO has crossed the threshold programmed at address C8h.
Line interrupt:
0 = The video line number has not yet been reached (default).
1 = The video line number programmed in address CAh has occurred.
Data interrupt:
0 = No data is available (default).
1 = VBI data is available either in the FIFO or in the VBI data registers.