I've coded a 16c54 to drive a serial device that requires CS, CLK and
Data.  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?  If I increase the cap too large
am I stressing the PIC's shunt transistor? (I am assuming the resistor
charges the cap and the PIC shorts the cap for the osc freq).  If the
resistor gets too high in value what problems might I have (any powerup
reset problems?)
   Thanks for any information.  The data sheet on the PIC doesn't give a
wide enough range on the RC osc chart.
   I know I could code in a delay loop, but since the end configuration
doesn't need it, I don't want to add extra unneeded code.  Ideally I
would like to optionally dip shunt in say a 0.1 uf cap across the 330pf.
The code wouldn't have to change.

David Schmidt
at home!