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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

file: /techref/microchip/math/bit/orbits.htm, 1KB, , updated: 2004/12/6 12:00, local time: 2009/11/22 00:48,
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Peter Todd has released source and sample projects for his artwork, including his 3d wireframe cube renderer for the PIC 18f6520 This includes examples of hardware developed with free software tools such as gEDA/gschem/PCB, SDCC, gputils and picp all on Linux. http://petertodd.ca/art/source-code/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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