28.3.2.5 Edge Detector
The edge detector can be used to generate a pulse when detecting a rising edge on its input. To detect a falling edge, the truth table can be programmed to provide an inverted output.
The edge detector is enabled by writing a
‘1
’ to the Edge Selection (EDGEDET) bit in the LUT n Control A
(CCL.LUTnCTRLA) register. To avoid unpredictable behavior, a valid filter option must be
enabled as well.
The edge detection is disabled by writing
a ‘0
’ to EDGEDET in CCL.LUTnCTRLA. After disabling an LUT, the
corresponding internal edge detector logic is cleared one clock cycle later.