I did this and doesn't work.

        movlw b'11100001'
        movwf TRISB
        call dly                ;aprox. 10ms
        movf PORTB,w
        movwf TEMP

Yet doesn't work correct. Why?


-----Mensagem Original-----
De: Tony Nixon <Tony.Nixon@ENG.MONASH.EDU.AU>
Para: <PICLIST>
Enviada em: Domingo, 3 de Outubro de 1999 20:15
Assunto: Re: CHANGE TRISB


> anbarsystem@ZAZ.COM.BR wrote:
>
> >The value that I get is crazy, it is very
> > different from the value that is really present.
>
>
> >                           BSF STATUS,RP0                  ;BANK1
> >                           BSF TRISB,7
;PB7,PB6,PB5
> > NOW ARE INPUTS
> >                           BSF TRISB,6
> >                           BSF TRISB,5
> >                           BCF STATUS,RP0                  ;BANK0
> >                           MOVF PORTB,W                   ;VALOR OF PB IN
W
>
> I would try to avoid multiple consecutive writes to the TRIS register
> using BSF intructions.
> Try
>         movlw b'11100001'
>         movwf TRISA
>
> Also, it may be possible, depending on your clock speed, that reading
> the port immediately after changing a port pin to an input is giving
> incorrect results, because the input register has not had enough time to
> stabilize. Maybe a small delay in between would fix this.
>
> --
> Best regards
>
> Tony
>
> http://www.picnpoke.com
> Email sales@picnpoke.com