When I'm interfacing with my GPS chip I have a circuit to shift the voltage
level of 3.3v to 5v (the gps operates using positive levels), and when
testing using the PC yes, I have a MAX232N.

----- Original Message ----- 
From: "Bob Ammerman" <rammerman@verizon.net>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Wednesday, November 03, 2004 5:31 AM
Subject: Re: [PIC]: Framing Error


> Do you have a MAX232 or equivalent or other inverting circuit?
>
> Bob Ammerman
> RAm Systems
>
>
> ----- Original Message ----- 
> From: "Ken Pergola" <no_spam@localnet.com>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Sent: Wednesday, November 03, 2004 2:22 AM
> Subject: RE: [PIC]: Framing Error
>
>
> >
> > Hi Padu,
> >
> > My question to you is:
> >
> > What is the frequency Kenneth? :)
> >
> > Seriously, you left out one important detail in your message -- the Fosc
> > you
> > are supplying to the PIC:
> >
> > 1) What is your clock source for the PIC, and what is the frequency of
it?
> >
> > 2) Is it a clock oscillator, quartz crystal, or ceramic resonator?
> >
> > Please tell us the frequency that is stamped on the part. It could very
> > well
> > be that your percentage errors are great enough (between the frequency
> > deviance of your Fosc clock source and your PC's tolerance) to cause
your
> > framing errors.
> >
> > Best regards,
> >
> > Ken Pergola
> >
> >
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