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PIC Microcontoller Bit Math Method


Swap two bits in a register

Another of Dmitry Kiryashov's routines is this sequence of instructions for swapping bit pairs in a byte in five instructions/cycles. 

                                ;  (c) 1998 by Dmitry Kirashov

  movwf  X                      ;  Save the Incoming Byte in 
                                ;   a temporary register
                                ;  w = X = ABCDEFGH
  andlw  0x055                  ;  w = 0B0D0F0H
  addwf  X, f                   ;  X = ABCDEFGH + 0B0D0F0H
                                
  rrf    X, f                   ;  X = (ABCDEFGH + 0B0D0F0h) >> 1
  addwf  X, w                   ;  w = BADCFEHG

Wow, huh?

file: /techref/microchip/math/bit/swapbits.htm, 1KB, , updated: 2004/12/6 11:55, local time: 2009/11/7 18:40,
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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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