#define BIT(addr,bit) bit #define ADDR(addr,bit) addr #define MASK(addr,bit) 1<<(bit) Then: #define myflag somereg,5 movlw BIT(myflag) movf ADDR(myflag),w andlw MASK(myflag) etc...
Techniques for exploiting the parallelism of bitwise operations [incl bit reversals, counting, and Morton keys] by Ron Gutman
Shift by 4 bits at a time"
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<A HREF="http://techref.massmind.org/techref/microchip/math/bit/index.htm"> PIC Microcontoller Bit Math Methods</A>
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