Hello,
thanks again for your answer, I just experimented with WDT, it seems it has
got todo something with that, (see my prev post). However, I will certainly
keep this technique in mind for my final project (I don't know what it's
gonna be, but its gotta be something with LEDs coz I just lov um :)

Best regards!




----- Original Message -----
From: "Jinx" <joecolquitt@CLEAR.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, August 06, 2002 12:18 AM
Subject: Re: [PIC]: problems with delays (long newbie posting)


> > > run RLF PORTD,1  ;Shift the HIGH up the column
>
> Modifying the port directly *may* get you in trouble. There's been
> quite some discussion on read-modify-write of port latches
>
> It's better practice to use a shadow register and use that. Don't
> read the port, but instead just write the shadow to the port, eg
>
> movlw  0x01         ;initialise shadow
> movwf  shadow
> movf   shadow,w  ;write it to port
> movwf  portd
> call delay
>
> bcf  status,carry    ;rlf will move the carry flag into bit0 of shadow
> rlf  shadow,f           ;modify shadow
>
> movf  shadow,w
> movwf portd           ;write it to port
> call delay
>
> btfss   shadow,7   ;test for end
> goto............
>
> etc
>
> --
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>
>
>

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