David G. Schmidt wrote: >I currently only have LED's connected to the output ports but the >'bit twiddling' is too fast for me to check if I have all the timing correct. >I am using an RC osc (100K and 330pf cap). What I want to know is how >slow can I make the osc using RC parts? David: How about just changing your PIC's oscillator-type from "RC" to "XT", then clocking it with an external frequency-generator (which could even be a suitably-debounced pushbutton switch)? -Andy -- Andrew Warren - fastfwd@ix.netcom.com Fast Forward Engineering, Vista, California