On 23-Jan-02 Jennifer Loiacono wrote:
> Jennifer Loiacono
> President
> Automaton Engineering, Inc.
> P.O. Box 10282
> Brooksville, FL 34603When receiving serial data on the PIC18C442, the value
> is not reflected correctly in the RCREG reception register.  However, the
> signal on the receiving PIC is perfect in terms of timing and accuracy.
> Despite accurate signal levels, debugging RCREG immediately after data is
> received reveals that the byte seems to flip back and forth.
>
> e.g., a byte equal to 4 (dec) will oscillate between 4 and 32.  A byte equal
> to 1 will oscillate between 1 and 128, etc.

I'm not quite clear on what you mean by " oscillate between 1 and 128".

If I've missunderstood then please ignore me, but it sounds to me that you
reading the RCREG multiple times for each recieved character ?

I'm pretty sure that isn't allowed by the PIC.  You should read RCREG
ONCE and ONLY ONCE for each recieved character.

RCREG should be read ONCE each time the RCIF bit in PIR1 is set. Reading RCREG
will reset this bit automagically ready for the next character.

Peter Onion.

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