edge sensitive interrupts
Hi,
It depends purely on the application. If you want to interrupt your processor once on a transition then you can go for edge triggered interrupts. But suppose you have a application where a device wants to send you some junk of data then you declare the interrupt as level triggered. When the processor comes out of subroutine and it finds the interrupt pin still low, it may execute one instruction, and then again go back to interrupt.
Generally edge triggered interrupts are used when you want the processor to interrupt only once some condition has occured, irrespective of wether the interrupt generating signal was deasserted again by the source.
Best Regards,