David BALDWIN wrote:

>         rrf     w
>         btfsc   w
>
>         It doesn't work! Any idea?
>
> it does'nt work that way

you should specify the label and destination

like        RRF            temp,w
              BTFSC        temp,?

        temp is your  target you want to rotate and w is where you want to save
the result.
        temp is your  target you want to check and ? is the bit it will check.

Andre