why should I clear event in the interrupt handler

[summer]

as far as I am concerned, when I use PPI or SHORTS without interrupts, I DON'T need to clear the corresponding event registers, and task will be triggered once the event is generated. But when I enable interrupt, I have to clear the event register, otherwise, something wrong happened. Is it true that without interrupts, events will be cleared automatically? What's the differences between them?

[RK]

No with or without interrupts events aren't cleared automatically from the event register, you have to clear them if you want to reset it and are reading the register. PPI is triggered at a lower level from the actual event signal occurring, not from the level set in the register, so it doesn't matter in that case.

[summer]

thank you, but I am still a little bit confused about how the event interrupt mechanism works.