19.4.5 WDT Operation in Power-Saving Modes

The WDT if enabled, will continue operation in the Standby Sleep mode or Idle mode. The WDT module may be used to wake the device from Standby Sleep mode or Idle mode. When the WDT times out in a Standby Sleep mode or Idle mode, a Non-Maskable Interrupt (NMI) is generated and the WDTO bit (RCON[4]) is set. The NMI vectors execution to the CPU start-up address, but does not Reset registers or peripherals. If the device is in Standby Sleep, the SLEEP status bit (RCON[3]) will also be set. If the device is in Idle, the IDLE status bit (RCON[2]) will also be set. These bits allow the start-up code to determine the cause of the wake-up.