Hello Seth. Try the following:

RLF     PORTB,W         ;copy .7 bit to carry
RLF     PORTB,F         ;rotate PORTB

or

RRF     PORTB,W         ;copy .0 bit to carry
RRF     PORTB,F         ;rotate PORTB

WBR Dmitry.


Seth Fischer wrote:
>
> What does it mean to rotate a file _through the carry bit_ (RLF and
> RRF)?
>
> When executing RLF on portB (8 LEDs) I get this:
>
> portB = 00000001
>         RLF     portb
> portB = 00000011        ; I want only one bit high and 'walking' left
>         RLF     portB
> portB = 00000110
>         RLF     portB
> portB = 00001100
>
> What is happening?