Window Mode

In the Window mode operation, the WDT uses two different time-out periods:

When enabling the Window mode or when going out of the Debug mode, the window is activated after the first WDR instruction.

The figure below shows a typical timing scheme for the WDT operating in Window mode.

Figure 1. Window Mode Operation

The Window mode is enabled by writing a non-zero value to the Window (WINDOW) bit field in the Control A (WDT.CTRLA) register. The Window mode is disabled by writing the WINDOW bit field to ‘0x0’.