27.5.2 Power Management
After reset, all standard function device I/O pads are connected to the PORT, with outputs tri-stated and input buffers disabled, even if no clock is running.
The PORT will continue to operate in any sleep mode where the source clock is running.
Event inputs connected to the event system can be triggered without exiting sleep modes.
Refer to the PM - Power Manager chapter for details on the different sleep modes.
