Hi, most surely your interrupt should work fine, you might have problems with your interrupt priority.
What device are you using? 18F has interrupt priority! what is more important to you timer or INT0? recheck your datasheet.
THE ANSWER TO ALL INTERRUPT QUESTIONS AND TROUBLES IS: use Darrel Taylor's Instant Interrupt Routines, they are a gift from the heaven once you understand and get used to include them.
Search the forum for Instant Interrupts revisited.




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