Tim ODriscoll wrote :

> I'm receiving on portb,0, using a falling edge to cause an 
interrupt.

Does the ISR wait for the full byte to arrive ?

> ..and the first line of the ISR:
> 	bcf	intcon,INTF		; Clear the INT flag

Has the full byte been received at this time ?

> ..and the last line of the ISR:
> 	retfie				; Exit the ISR

Has the full byte been received at *this* time ?

Maybe there is a edge in the byte itself that casuses
the INTF bit to be reset. Then, when you RETFIE's,
your ISR will just be called again.

Jan-Erik.



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