Thanks for reply.

I examined the program for PIC 16f877, part of which I transcribe here:
<<
         ifc            INTCON,RBIF     ;Har porttillst=E5ndet =E4ndrats?
                 goto  isrP_NoRBIF             ;Om inte: hoppa till n=E4sta=
=20
kollrutin

      ;L=E4s in nya tillst=E5ndet
               movf    PORTB,w                 ; *** Ingen annanstans f=E5r=
=20
PORTB l=E4sas dierkt! ***
               c               INTCON,RBIF     ;Kvittera att vi har l=E4st
               movwf   B_PORTBIN               ;lagra f=F6r denna samt andra=
=20
rutiner p=E5 port B

      ;Bearbeta tv=E5fassignal genast!
      ;H=E4mta fasbitarna fr=E5n B_PORTBIN till B_2phState 1:0, de f=F6rra i=
 3:2...
               cc                              ;Rotate the new bits in...
               ifs             B_PORTBIN,5
                 sc
 >>.....................

Pleae there is someone that can explain me the meaning of the expressions=20
like:<ifc>,<ifs>,<c>,<cc>,<sc> or the corrisponding instructions in MPLAB=20
assembler?

Sincerly
Renzo Giurini


At 09.49 30/12/01 -0800, you wrote:
>Here's some code in the archives:
>http://www.piclist.com/techref/microchip/qenc.htm
>David
>
>Renzo Giurini wrote:
>
> > Hi,
> > I would control the rudder of a model boat sensing the direction of a
> > compass and/or the direction of wind.
> > I think of a simple shaft encoder using i.e. part of mouse.
> >
> > But how read or detect the direction (clockwise or counter-clockwise)?
> >
> > Thanks
> > Renzo Giurini
> >
> > --

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