Actually, if high three bits aren't valued those can be zeroes.
So left shifting through the register can be rewritten as:

        rlf     byteX,W         ;000abcde f -> 00abcdef 0
        addlw   B'11100000'     ;a -> carry
        andlw   B'00011111'     ;000bcdef
        movwf   byteX           ;store updated back

Am I clearly think that you going to shift it left through
many register ? If so this is what you need probably.

James Newton wrote:
>
> That being the case, I don't understand why the top three bits of byte 2
> need to be excluded. Seems like it would be simpler to just preshift the
> data in your table by three bits left and then just load carry on each loop
> by shifting it once more to the left to be setup for (Oliver or Demitry's)

Hmm.. James you know that nobody before has changed my name in such way
;)
Sound close to Demetriy ;) (Actually my name has came from greek
language
I guess)

WBR Dmitry.


>         rlf     byte1,W         ;get new bit from carry
>
>         xorwf   byte1,W         ;get difference
>         andlw   B'00011111'     ;0's will mask unchanged bits
>         xorwf   byte1,F         ;update only required bits
>
> or was that what you ment when you said, "byte 2 is just for my example"?

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