45.6.2.12 Window Monitor

The window monitor feature allows comparing the conversion result in the RESULT register to predefined threshold values.

The window mode is selected by writing the Window Monitor Mode bits in the Control B register (CTRLB.WINMODE). Threshold values must be written in the Window Monitor Lower Threshold register (WINLT) and Window Monitor Upper Threshold register (WINUT).

When the Window Single Sample (CTRLB.WINSS) bit is written to '1', the window comparator is working on each sample instead of the accumulated value. The number of samples matching with window comparator is available on Window Comparator Counter bits (STATUS.WCC).

In differential mode, WINLT and WINUT are evaluated as signed values. Otherwise they are evaluated as unsigned values. The significant WINLT and WINUT bits are given by the precision selected in the Conversion Result Resolution bit group in the Control B register (CTRLB.RESSEL). This means that for example in 8-bit mode, only the eight lower bits will be considered. In addition, in differential mode, the eighth bit will be considered as the sign bit, even if the ninth bit is zero.

The INTFLAG.WINMON interrupt flag is set when either the conversion result matches the window monitor condition, when the Window Comparator Counter is not zero in case of accumulation with CTRLB.WINSS=1.