PIC Microcontoller Bit Math Method 

From Dmitry Kiryashov [zews at AHA.RU]
a) abcd.efgh -> bcda.fghe
 rlf X,W
 rlf X,F ;bcdefgha
 swapf X,W ;...a...e
 xorwf X,W
 andlw 0x11 ;...<a^e>...<e^a>
 xorwf X,F ;bcdafghe
b) abcd.efgh -> dabc.hefg
 rrf X,W
 rrf X,F ;habcdefg
 swapf X,W ;d...h...
 xorwf X,W
 andlw 0x88 ;<d^h>...<h^d>...
 xorwf X,F ;dabchefg

Archive:

file: /Techref/microchip/math/bit/rotnib.htm, 1KB, , updated: 2003年10月6日 08:51, local time: 2025年9月5日 19:38,
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