32.6.5 PORT Access Priority

The PORT is accessed by different systems:

  • The ARM® CPU through the high-speed matrix and the AHB/APB bridge (APB)

  • EVSYS through four asynchronous input events

The following priority is adopted:

  1. APB
  2. EVSYS input events, except for events with EVCTRL.EVACTn=OUT, where the output pin directly follows the event input signal, independently of the OUT register value.

For input events that require different actions on the same I/O pin, refer to Events.