Scope xefinetly not the case, and the pause statement is working properly. the problem is with pauseus statement and only on small durations. say, pauseus 1200 and above, give almost perfect result. it is very interesting fact that, pauseus 1, gives 200 us delay between pulsout statements on 16 f628a @ 4 mhz, and only 48 us delay on 12 f683!