>I'm looking for a nice efficient way to count the number of bits set in an
>8-bit
>register.  I _know_ there were some nice pieces out there, but I can't seem
>to
>find one.

How about:

CBLOCK 0x0C
   Count
   Loop_Count
ENDC

   clrf Count
   movlw 0x08
   movwf Loop_Count
   clrc
Loop
   rrf Number
   btfsc STATUS, C
   incf Count
   decfsz Loop_Count
   goto Loop

Where "Count" holds the number of bits set.  I don't know about "efficient,"
but I'm not sure how to do it faster offhand.

or, by brute force:

   clrf Count
   btfsc Number, 0
   incf Count
   btfsc Number, 1
   incf Count
   ... etc.

This would actually have fewer instruction cycles, but would take up just
about twice the program memory.

--Andrew
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