Thanks Olin.

But, the basic question has not been answered...

The question is whether the .asm templates from Microchip for the 
PIC12F675 successfully save and restore STATUS and W registers.

I believe they do, Tamas believes they don't (I think he believes that 
anyway, as well as perhaps some others).

Here is the code, again.... as copied / pasted from the file 
12F675TEMP.ASM file distributed by Microchip (this time with the 
trailing 'e').

        ORG     0x004             ; interrupt vector location
        movwf   w_temp            ; save off current W register contents
        movf    STATUS,w          ; move status register into W register
        movwf    status_temp       ; save off contents of STATUS register


; isr code can go here or be located as a call subroutine elsewhere


        movf    status_temp,w     ; retrieve copy of STATUS register
        movwf    STATUS            ; restore pre-isr STATUS register 
contents
        swapf   w_temp,f
        swapf   w_temp,w          ; restore pre-isr W register contents
        retfie                    ; return from interrupt

As has been suggested numerous times by others, there are other ways to 
do the same thing (and I have changed my code as well). The question is, 
whether, on the PIC12F675, the above actually works?

Yes, No, if not, then why...?

It is only 8 instructions, and, if it does not work then there is 
something I have missed in my understanding of the individual 
instructions, MPSIM, and more.

Rolf


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist