Tony

        I did not expect to get a response so fast, thanks.  However the
code that you supplied executed in exactly the same way as my original
code.  It seems that when I rrf the a register the first bit is sent to the
carry.  When the instruction comes around a second time it again shifts the
first bit into the carry instead of the second bit.

Scott

Tony Nixon wrote:

> Scott wrote:
> >
> > I want to use portA to read two switches for one project and four
> > switches for another.  How do I make each bit rotate through the carry
> > flag consecutivly.  I have been using the following code, but it only
> > reads the first bit. I am using a 16c56
> >
> >              movlw         0x0F
> >              tris              PORTA
> >              movlw         0x00
> >              tris              PORTB
> >
> > input      bcf              STATUS, C
> >              rrf               PORTA, W
> >              btfsc            STATUS, C
> >              goto             code_1
> >              rrf               PORTA, W
> >              btfsc            STATUS, C
> >              goto             code_2
> >              goto             input
> >
> > I was able to write the rest of this program and simulate it with
> > success and I have been stareing at this part for four hours with no
> > luck.
> >
> > Scott
>
> Try this
>
> input   movf portA,w
>         movwf Temp
>         rrf Temp
>         btfsc status,C
>         goto code_1
>         rrf Temp
>         btfsc status,C
>         goto code_2
>
>         etc....
>         goto input
>
> You don't need to preclear the carry bit because it will be overwritten
> on the first rrf instruction anyway.
>
> --
> Best regards
>
> Tony
>
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