15.5.1 CLRWDT Considerations (Windowed Mode)
When in Windowed mode, the WWDT must be armed before a CLRWDT
instruction will clear the timer. This is performed by reading the WDTCON0
register. Executing a CLRWDT
instruction without performing
such an arming action will trigger a window violation regardless of whether
the window is open or not. See Table 15-2 for more information.