22.6.3 Interrupts

The EVSYS has the following interrupt sources:

• Overrun Channel n (OVRn): for details, refer to The Overrun Channel n Interrupt section.
• Event Detected Channel n (EVDn): for details, refer to The Event Detected Channel n Interrupt section.

These interrupts events are asynchronous wake-up sources. See Sleep Mode Controller.

Each interrupt source has an interrupt flag which is in the Interrupt Flag Status and Clear (INTFLAG) register. The flag is set when the interrupt is issued. Each interrupt event can be individually enabled by setting a ‘1’ to the corresponding bit in the Interrupt Enable Set (INTENSET) register, and disabled by setting a ‘1’ to the corresponding bit in the Interrupt Enable Clear (INTENCLR) register. An interrupt event is generated when the interrupt flag is set and the corresponding interrupt is enabled. The interrupt event works until the interrupt flag is cleared, the interrupt is disabled, or the Event System is reset. See INTFLAG for details on how to clear interrupt flags.

All interrupt events from the peripheral are ORed together on system level to generate one combined interrupt request to the NVIC. Refer to the Nested Vector Interrupt Controller for details. The event user must read the INTFLAG register to determine what the interrupt condition is.

Note that interrupts must be globally enabled for interrupt requests to be generated. Refer to Nested Vector Interrupt Controller for details.