Sort of a basic question that I thought I had understood.....you would think by now....the obvious would be obvious...
 
Have a crystal, 4.1952MHz, so it has a cycle time of 0.95347uS.  I am using TMR0 to generate an interupt, with a prescaler set for TMR0 (not the watchdog) of 1:64.
 
OK, so by calculations, that should be every 64 tics or 61.022uS, TMR0 is clocked.  Using the rollover for the interupt it should then be 15.621mS for each interupt cycle.  I am measuring 13.32mS.  What am I missing here...


		
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