External pause originates from the external pause line. Pulling this line to zero will cause an immediate pause. The external pause overrides other pause conditions set to the GT-DIO board.
The P mask and event registers can be used to create conditional pauses that depend on external event lines. The 16 external event lines are ANDed with pre-defined masks and compared with pre-defined events in register P.
The external/internal events pause function in the board is shown in the figure below:
External Events Pause Block Diagram