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Interrupt priority query

Neil Radnitz

I am currently using timer2 count a number of preset timeouts on an AC waveform for an AC regulator.

I have given timer2 the highest interrupt priority, but have found that occasionally timer1 (used for generally polling), which is at a lower priority level, interrupts timer2's routine.

I have run the debugger; timer2's priority is definitely greater than timer1.

I have been sure to clear the timeout flag before the pending flag is cleared at the end of each timer interrupt function.

Have I misunderstood? The impression I got from the manual is that a lower priority will only execute after the higher priority has exited its interrupt?

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