>#define DATA_RDY 0x1
>
>btfsc    FLAGS, W     ;  (NOT a valid instruction :^(
>...
>
>Any opinions on what the "next best" approach might be?  I'm
>thinking that a bit-ordinal index w.r.t. PCL might be the ticket,
>but just wonder if there might be more tricks I'm unaware of.

I think you are then into something like the following

NOTE untested examples follow, mnemonics not necessarily correct

;
;  set bit in W
;
orlw    1<<DATA_RDY

;
; reset bit in W
;
andlw    oxff^(1<<DATA_RDY)


;
;    test bit in W without using temporary register
;
xorlw    1<<DATA_RDY    ; complement bit
xorlw    1<<DATA_RDY    ; return it to original state
skipnz                  ; substitute appropriate skip mnemonic here


Of course if you are prepared to use a temporary register then there are
other ways of testing the bit, but it is destructive on the temporary
register.

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