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

http://www.picnpoke.com
Email sales@picnpoke.com