> I've added some comments to say what I think the code is doing, check if
> they are what you expected...
>
> > B1_COUNT     equ     0xA0
> > B1_ARRAY    equ     0xA0
> > B1_OTHERDATA equ   0xC3
> > B1_MOREDATA equ   0xC4
> >
> > ; A method "foo" is called twice by my main program logic.
> > ;
> > foo
> >     banksel    B1_COUNT ; This is the ONLY reference to B1_COUNT
> anywhere:
> >     incf    B1_COUNT  ; Increment data stored at 0xA0
> >     movlw    B1_ARRAY
> >      addwf    B1_COUNT, W     ; Add literal 0xA0 to current value at

> 0xA0
> >     movwf    FSR      ; Store that as an address
> >     incf        INDF  ; Increment the value at register ((contents of
> location 0xA0)+0xA0)
> >     return
>
> Where is B1_COUNT initialised?
>
> If it starts life as 94 or greater, the value in FSR will overflow
>
> If it starts life as 0xFF, on the first call it will be incremented to
> 0x00, then it will overwrite itself with 0xA0
>
> There are other options for odd behaviour, I would check very carefully
> what the value is set to on entry to 'foo', perhaps transmit it from the
> serial port before and after foo is called?  Then come back and tell us
> what the results were.
>
> Nigel
> --
> Nigel Orr, Design Engineer                 EraseMEnigelspam_OUTTakeThisOuTaxoninstruments.co.uk
> Axon Instruments Ltd., Wardes Road,Inverurie,Aberdeenshire,UK,AB51 3TT
>                Tel:+44 1467 622332 Fax:+44 1467 625235
>                    http://www.axoninstruments.co.uk
>
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>

> Upon startup, I always do:
>     bcf    STATUS, RP0
>     bcf    STATUS, RP1
> I've not touched the IRP bit directly, but I believe it's supposed to
> power-up as '0'.
>
> and
> >Nigel Orr wrote
>
> >> ...
> > >     incf        INDF  ; Increment the value at register ((contents of
> > > location 0xA0)+0xA0)
> ...
> > > Where is B1_COUNT initialised?
>