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msp430: interrupt delayed by atomic section?

PROSPERO LOMBARDI
Intellectual 395 points

Hi all,

I was not able to find in the manual nor in the forum the answer to the following simple question:

Does an interrupt occurring inside an atomic section will be serviced after EINT?

Here what i mean:

...

DINT

NOP

instruction 1

instruction 2 <- an interrupt occur here and IFG is set by hardware (IE is obviously 1)

instruction 3 

EINT

instruction 4 ->does ISR fires here? Or the interrupt event is lost?

...

Thank you,

PL

  • 0
    Guru 74080 points
    The event is not lost as long as there weren't two consecutive interrupts from the same source during that time, of course. If the flag is set during disabled interrupts, they will be serviced immediately after interrupts are enabled again. But interrupt priority comes into place here - if there are several pending interrupts from different sources, the one with the highest priority will be serviced first. Of course servicing higher priority interrupts mustn't take too long so that another interrupt from the same source occurs while there is a pending one already.

    Dennis
  • 0 in reply to Dennis Eichmann
    Intellectual 395 points
    Thank you Dennis for your answer.

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