Sorry, probably didn't make myself clear....
Specifically what I was trying to do was specify a register to be read
rather than reading from the INDR

For example, if I have a block of registers set aside for some data, I can
clear sequential registers by:

movlw MYFIRSTREG
movwf FSR
LOOP
movlw 0
movwf INDR
incf      FSR,1
goto    LOOP

So this clears an infinite number of registers. In practice a quick decfsz
would limit it. In practice however, we often want to READ from one and copy
it into the next.
Clearly this could be done using

movf READFROM1,F
movwf MOVETO1
movf READFROM2,F
movwf MOVETO2
.........

etc, etc
But surely it would be better if an indirect addressing system or some
work-around meant you could avoid explicitly stating such commands. I ask
because I need to copy 96 registers from one page to another and I don't
want to end up writing 96*2 lines of code.......

Ben


----- Original Message -----
From: Al Williams <alw@AL-WILLIAMS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 27, 2001 4:08 PM
Subject: Re: [PIC]: reverse indirect addressing


> If I understand your question, yes. When you load FSR, the INDF register
> takes on the identity of the referenced register. So:
>
>   movlw 0xA0   ; let's point at register 0xA0 for some reason
>   movwf FSR
>   movlw 0xA5
>   movwf INDF   ; 0xA5 -> register 0xA0
>   movf INDF,W  ; register 0xA0 -> W (should still equal 0xA5)
>
> I'm not sure what you read that led you to think INDF only takes writes?
>
> Regards,
>
> Al Williams
> AWC
> * Floating point A/D
> http://www.al-williams.com/awce/pak9.htm
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Benjamin Bromilow
> > Sent: Monday, August 27, 2001 9:38 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [PIC]: reverse indirect addressing
> >
> >
> > Hi all,
> >
> > As I understand it, with indirect addressing you can put a given
> > value into
> > a referenced register. Is there any way this can be done in reverse ie
to
> > read the value in a referenced register or must all register reads be
done
> > directly and explicitly??? I've had a good look around and can't find a
> > work-around..... It seems strange that indirect addressing appears to
only
> > work for writes!
> >
> > Ben
> >
> > --
> > http://www.piclist.com hint: The PICList is archived three different
> > ways.  See http://www.piclist.com/#archives for details.
> >
>
> --
> http://www.piclist.com hint: The PICList is archived three different
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>
>
>

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