> I've got this question over which I have
> been breaking my head far too long. Maybe
> somebody can get me out of my misery...
>
> What's the meaning of the SWAPF instructions,
> performed on W and STATUS register in the
> saving and restoring code, proposed by
> Microchip in the PIC datasheets ???
>
This is just a neat little trick they use to save the state of a file
register without affecting the status bits, such as Z, C...etc

If you used a movf instruction it would affect the Z bit.

Example:
swapf status,0
This swaps the nibbles in status and stores the result in W

movwf temp
temp now contains the status with the nibbles swapped

swapf temp,0
swaps the nibbles back to thier original state and stores the result
back into W.

movwf status
Status is effectively restored now

I hope this helps......
Mike henning
mikeh@smart.net