When the timer is enabled in basic mode, the software must restart or disable the time in the open (second) window time period only. If the software is successful, it is considered a good event. If the timer gets a restart or disablement before the second window expires, it is considered a bad event and can lead to a reset.
If the timer gets a restart attempt or disablement attempt in the close (first) window, it is considered a bad event. In this scenario, the timer is not disabled.
The basic window mode includes an optional program sequence monitor feature that provides a simple handshake between the software and the watchdog timer to help improve the integrity of the system.