19.6.2 WDT Operation in Standby Sleep Mode

The WDT, if enabled, continues operation in the Standby Sleep mode. The WDT may be used to wake the device from the Sleep mode. When the WDT times out in Sleep, an 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. The Standby Sleep status bit (RCON[3]) is set indicating the device was in the Standby Sleep mode. These bits allow the start-up code to determine the cause of the wake-up.