Najemy, Daniel wrote:
>
> Good morning -
>
> I'm trying to do the following:
>
> I have a byte (let's call it TEMP), and I'm trying to logically 'OR'
> together 3 of the bits within the byte.
>
> ie. RESULT = (TEMP,3) or (TEMP,4) or (TEMP,5)
>
> There doesn't seem to be any bit wise 'or' functions. Any ideas on how
> to implement this?

Yeah, we had this discussion a few months back.

Using the nomenclature then, here's a way to or two arbitrary bits in
two aribtrary registers and place the result in another arbitray
register: e.g. C.bit_C = A.bit_a | B.bit_b:

       BCF     C,bit_c
        BTFSS  A,bit_a
         BTFSC B,bit_b
          BSF  C,bit_c

Which could be extended for three or more bits.

However in your case, there's even a simpler trick:

      CLRF   RESULT        ;Assume all three bits are low

      MOVF   TEMP,W
      ANDLW  (1<<3) | (1<<4) | (1<<5)
      SKPZ
       INCF  RESULT        ;At least one bit was high

Scott
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