B1_COUNT     equ     0xA0
B1_ARRAY    equ     0xA0

Is it OK, that this is one and the same register?

Samo



--- Jim Tellier <jimtellier@COX.NET> wrote:
> OK, I've got an "interesting" bug-hunt going on, and
> it's about time I asked
> a couple of sanity-check questions!   I was going to
> post the entire .asm,
> but perhaps that's not (yet) necessary... we'll see!
>
> Using '16F877.  I've set up a data structure in Bank
> 1:
> 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
>     movlw    B1_ARRAY
>      addwf    B1_COUNT, W
>     movwf    FSR
>     incf        INDF
>     return
>
> The interrupt service saves and restores FSR (and W,
> STATUS, PCLATH) in the
> "standard" manner.   (FSR *is* used in the intsvc to
> store characters
> received from serial port, but it is set
> to point to a buffer space in Bank 0).
>
> THE PROBLEM: sometime well after "foo" is called
> (exactly twice), when I go
> to read the contents of B1_COUNT.... it's
> sporadically incorrect!
> I note that ALL of what I expect to see elsewhere in
> both Bank 0 and Bank 1
> data space is correct... except for this one
> address!
>
> Is there anything "odd" about what I'm doing?  I
> can't seem to think of new
> ways to look at this one!
> (Oh, BTW, this one's not easily simulated, due to
> the need for RS232 and I2C
> I/O.. :^(
> Thanks for any helpful thoughts you might have!
> Jim
>
>
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