David BALDWIN <db@SDM.BEL.ALCATEL.BE> wrote:
>        sublw   .3
>
>and it is not working properly. When I am replacing it with addlw 0xFD,
>everything is working! I though the assembler was translating a sublw
>into the right addlw?! Is it the same opcode?

   sublw .3      does:  3 - w
   addlw h'fd'   does:  h'fd' + w  =  - 3  +  w  =  w - 3

   BTW this is a very handy trick to reverse the subtraction order.


>
>        call    EEREAD
>        btfsc   w,2       <- Illegal.  Can't test bits in w.
>        goto    OK           This is actually testing the register
                              pointed to by the FSR register


>        call    EEREAD
>        btfsc   EEREAD,2  <- ??  EEREAD is a label in your program.
>        goto    OK           The register actually being tested
                              depends on the address of EEREAD.


--
Bob Fehrenbach    Wauwatosa, WI     bfehrenb@execpc.com