> I purchased a MAX232 RS-232 controller/driver chip, and I've noticed
> in the archives that people have had varying results with resonators
> and xtals when controlling serial communications in software.
> I'm wondering
> if I have to worry about clock drift between the MAX232 and a
> PIC, using
> the same clock source for both (if possible), and if the
> MAX232 has the
> same problems a software-based RS-232 controller has.  I'm
> still a neophite,
> so I will try to make some sensible questions and post to the
> PIC: threads.

Welcome to the group, and if you have not done so yet do read
http://www.voti.nl/swp (and after that read the rest of my website, and
after that all of http://www.piclist.com/techref/microchip/index.htm).

A MAX232 is a level converter and has nothing to do with the content of
the asynchronous signal. The main discussion issue with asynch is how
much clock difference between sender and receiver is acceptable (and
whether a PIC with internal oscillator is acceptable). But no problem
with crystal or resonator clocks.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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