When exactly is PIT reset? Kinetis

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When exactly is PIT reset? Kinetis

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Contributor IV

Is a Periodic Interrupt Timer (PIT) reset the moment the rollover/interrupt occurs, or the moment the interrupt flag is cleared?

Also, if poor code was involved and the interrupt took way to long, would such and interrupt routine be re-entrant?

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NXP Employee
NXP Employee

Hi, Joe

Yes, PIT load their start values, as specified in their LDVAL registers, then count down until they reach 0. Each time a timer reaches 0, it will generate a trigger pulse and set the interrupt flag. Then they load their respective start value again. So it can reset value.

Hope my reply can help you.

Best Regards

Paul

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