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[PIC] Multiple interrupt handling

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sangeo

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HAI EVERY ONE

I AM WORKING WITH PIC 16F887,AND MICROC IDE,I HAVE A LITTLE DOUBT ..WHEN TIMER2 INTERRUPT OCCURS DURING THE EXECUTION OF PORTB INTERRUPT ,WHAT WILL HAPPEN? WHETHER PORTB EXICUTION STOP AND INTERRUPT VECTOR GOING TO TIMER2 INTERRUPT
NOR PORTB EXICUTION COMPLETES AND THEN INTERRUPT VECTOR GO TO TIMER2 INTERRUPT .ACTUALLY I TRIED TIMER2 INTERRUPT WROTE ABOVE PORTB INTERRUPT AND FOUND TIMER2 ISR EXICUITES DURING EXECUTION OF PORTB ISR.


check my program segment -http://obrazki.elektroda.pl/2119728000_1391104153.jpg
 

yes when timer2 interrupt occurs(here considering timer2 to be having higher priority) it is expected to leave whatever task it is doing & jump to it's respective isr routine.
isr execution depends on priority assigned the most prioritized will be preferred as in your case it will be execution of timer2 isr rather than portb isr.
if your portb program is not getting executed after there is interrupt that means you have not cleared timer you have used clear the timer then it may execute.
 
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    sangeo

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okk yes I got it thanks..a lot Disha Karnataki
 

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