Does the volatile keyword for a variable (using C30 PIC24) guarantee an 
atomic operation when accessed regarding interrupts?  i.e. if I declare 
a volatile DWORD elapsed_time and increment it in the timer interrupt, 
do I need to worry about disabling interrupts to access it in the main 
loop?  I always do, just wondering if I could live without it, and can't 
think of a simple test to prove it.

Thanks,

Tony



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