On August 19 (sorry, I'm behind on PICLIST!) Yves Heilig
<Yves.Heilig@WANADOO.FR> wrote:
> I'm a beginner in programming of PIC, somebody can it come to my
> help? Here my problem: I want to test the contents of an indexed
> table of the form flag(Y), Y being a variable
>
> Example:
> The variable Y=2
> How to test bit 2 of flag ?

A handy subroutine:

;----------
; TWO_POWER: two raised to the power of W
;----------
two_power:
        addwf   pcl, f
        retlw   b'00000001'
        retlw   b'00000010'
        retlw   b'00000100'
        retlw   b'00001000'
        retlw   b'00010000'
        retlw   b'00100000'
        retlw   b'01000000'
        retlw   b'10000000'


So, you'd do something like:

        movf    Y, w
        call    two_power
        andwf   flag, w
        btfss   status, z
         goto   bit_y_is_set

Brian