PIC Microcontoller Bit Math Method

OR two bits

Obviously setting, or clearing a bit is done with bsf and bcf. Toggleing a bit is done with XOR and a mask. But what if you don't know which bit to set, clear or toggle before the program is compiled?

From: http://www.myke.com/basic.htm

Two bits will be "ORed" together to find set/reset a third bit. The result is expected to be false and when either bit is set, the result is true:

  bcf    Result                 ;  Assume the result is False
  btfss  BitA                   ;  If BitA != 0 then result is True
   btfsc BitB                   ;  If BitB == 0 then result is False
    bsf  Result                 ;  Result is True, Set the Bit

See also:

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