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PIC Microcontoller Bit Math Method


AND 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

Using the code below, two bits will be "ANDed" together to find set/reset a third bit. 
  bsf    Result                 ;  Assume the result is True
  btfsc  BitA                   ;  If BitA != 1 then result is False 
   btfss BitB                   ;  If BitB == 0 then result is False
    bcf  Result                 ;  Result is False, Reset the Bit

See also:

file: /Techref/microchip/math/bit/andbits.htm, 1KB, , updated: 2004/12/6 12:59, local time: 2012/5/24 02:24,
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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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