22.6.2.5.2 Synchronous Path

The synchronous path should be used when the event generator and the event channel share the same generator for the generic clock and also if event user supports synchronous path. If event user doesn't support synchronous path, asynchronous path has to be selected. If they do not share the same clock, a logic change from the event generator to the event channel might not be detected in the channel, which means that the event will not be propagated to the event user. For details on generic clock generators, refer to GCLK - Generic Clock Controller.

When using the synchronous path, the channel is able to generate interrupts. The channel status bits in the Channel Status register (CHSTATUS) are also updated and available for use.

If the Generic Clocks Request bit in the Control register (CTRL.GCLKREQ) is zero, the channel operates in SleepWalking mode and request the configured generic clock only when an event is to be propagated through the channel. If CTRL.GCLKREQ is one, the generic clock will always be on for the configured channel.