That's correct.

No priorities for 16F's. It's a limitation of the PIC's, not the Instant Interrupts.

>> then for any time measuring program we must make sure that the ISR of each of the interrupts are so small that they dont cause a large error in measurement.

Unless you use the capture mode of a CCP module, also true.

But if you switch to 18F's, the problem goes away.
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