29.4.7.1 Operation Overview

If an expected event fails to arrive before the WDT time-out period expires, the PTG module:
  1. Aborts the (failing) command underway.
  2. Halts the sequencer (PTGSTRT = 0).
  3. Sets PTGWDTO = 1.
  4. Issues a Watchdog Timer error interrupt to the processor.

The user can either use the Watchdog Timer error interrupt or periodically poll the PTGWDTO bit (PTGCON[6]) to determine that a WDT event has occurred.