Did you make sure the inputs are all configured to be digital?
Also, according to the datasheet, RA5 is input only.  Could
that be part of the problem?

Mike H.

>1. When writing data to port A, the port configuration in the TRISA
>       register changed, so that one of the outputs became an input.
>       This of course caused a malfunction in our circuit. Rewriting the
>       TRISA register with the correct value helped somewhat, but did not
>       completely solve the problem. We assume that the wrong bank
>       (bank 1) was addressed during access of the port data register.
>
>2. About two of three devices hang after having worked for several
>       minutes, though the watchdog has been activated. This application
>       makes extensive use of interrupts. We assume that incorrect RAM bank
>       addressing causes this problem, too.
>
>We tested the same program (i.e. the same HEX file) with three
>different controller types:
>- PIC16F628  - runs well
>- PIC16F628A - runs well
>- PIC16F648A - problems occur
>
>Additionally, we used a PIC 16F873 and an 873A with an adapter and
>a small software modification, and both performed without problems.
>
>We assume that there is a critical detail in the internal structure
>of the controller. We do not know the exact cause of the failures,
>nor can we safely reproduce the problem in terms of a "recipe" to
>make it happen.
>
>Perhaps anyone experienced similar problems with these chips,
>or can give any hint?
>
>Thanks in advance for any response.
>--
>Grzegorz Zalot
>
>complex ltd.
>office tel/fax : +48 32 2505840
>mobil : +48 501 301515
>
>http://www.complex.org.pl/
>mailto:complex@alpha.pl
>
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