43.6.13.1 Continuous Measurement during Sleep

When a comparator is enabled in continuous measurement mode and the filtering options are disabled, the GCLK_AC is disabled during sleep and the comparator will remain continuously enabled and will function asynchronously. The current state of the comparator is asynchronously monitored for changes. If an edge matching the interrupt condition is found, GCLK_AC is started to register the interrupt condition and generate events. If the interrupt is enabled in the Interrupt Enable registers (INTENCLR/SET), the AC can wake up the device; otherwise GCLK_AC is disabled until the next edge detection.

If the filtering is enabled, the GCLK_AC is kept running, the comparator will remain continuously enabled and will function synchronously. The current state of the comparator is synchronously monitored for changes. If an edge matching the interrupt condition is found and the interrupt is enabled in the Interrupt Enable registers (INTENCLR/SET), the AC can wake up the device.