Is cw_ccw in Bank 0 or Bank 1 ? :-)

greetings Martin

;**********************************************
;**   name:      Martin Schaefer             **
;**   company:   elektronik 21 GmbH, Germany **
;**   e-mail:    schaefer@elektronik21.de    **
;**********************************************


> -----Original Message-----
> From: Chunhee Song [mailto:chunhee@lpl.arizona.edu]
> Sent: Tuesday, June 20, 2000 5:51 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: zero flag is never set!!!
>
>
> thanks for your reply, Martin.
>
> But still zero flag is never set.
> I spent more than 4 hours for this part but didn't get right.
> I am very
> sure I got 'c' in rxreg register. I tested it. Here is some
> more specific
> code.
>
> ** cw_ccw has 'c' **
>         bcf     status, rp0     ; cw_ccw is in bank 0
>         movlw   'c'
>         xorwf   cw_ccw, w               ; 0x63 is "c"
>         btfss   status, z
>           goto  coclockwise     ; zero flag occurred
> clockwise
>         bsf     STATUS,RP0      ; select page 1 registers
>         bcf     trisc, 2
>         bsf     trisc, 3        ; high
>         bcf     trisc, 4        ; low
>           goto  dirok
> coclockwise
>         bsf     STATUS,RP0      ; select page 1 registers
>         bcf     trisc, 2
>         bcf     trisc, 3        ; low
>         bsf     trisc, 4        ; high
> dirok
>         bcf     STATUS,RP0      ; select page 0 registers
>         movlw   0x01            ; prescaler 1:4
>         movwf   t2con
>         bsf     T2CON,tmr2on    ; enable timer2
>         movlw   0x3f            ; pwm mode
>         movwf   CCP1CON
>
> This code always ends up heading to coclckwise even though
> cw_ccw has 'c'.
> Any idea???
>
>  On Tue, 20 Jun 2000, Martin Hill wrote:
>
> > >
> > >   I was trying to get a character 'c' from rxreg and if it is 'c'
> > > my program has to do something.
> > >
> > > 'c' i saved in temp register.
> > > ;I already did bit processing in case,
> > > movf    temp, w
> > > andlw   oxff
> > > movwf   temp;
> >
> > I can't really see the point of this section.  Surely it
> just moves temp
> > to w and then back again.
> >
> >
> >
> > > .....
> > > movlw   0x63    ; since c is 0x63 in hexadecimal
> > > xorwf   temp, w
> > > btfss   status, z
> > >   goto  dosomething
> > > dosometing....
> >
> > Apart from the fact you are executing the same code irrespective of
> > the state of Z this looks O.K.  The only thing that could
> be wrong is if
> > c is not 0x63.  I would use.
> >
> > movlw   'c'
> > xorwf   temp, w
> > btfss   status, z
> > goto  dosomething
> > dosometingelse....
> > ;whatever you do when it is a 'c'
> >
> > dosomething
> > ;whatever you do when it isn't a 'c'
> >
> >
> > Martin
> >
>