I do believe that the response to this question is in err. The previous
responses indicating external hardware really seem to be your answer.
This last response would give a pulse time of somewhere around .5mS not
the .5uS requested.

Fred

> ----------
> From:         Andre Abelian[SMTP:engelec@EARTHLINK.NET]
> Sent:         Wednesday, July 23, 1997 5:39 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: Output frequency
> 
> WF AUTOMA‚̀O wrote:
> > 
> > Hello, PICmaniacs
> > 
> >         I'm using a PIC16f84 at 4mhz, and would like to know if is
> > possible to me to create a frequency of 2mhz at some output pin!
> > 
> >         Maw.
> 
> 
> Yes you can.
> loop    bsf     porta,ra0
>         call    delay
>         bcf     porta,ra0
>         goto    loop
> delay   movlw   .100    ; DECIMAL VALUE IS YOUR FREQUENCY
>         movwf   count
> d       decfsz  count
>         goto    d
>         retlw   oo
> 
> 
> HOPE THIS HELPS
> 
> ANDRE  ABELIAN
>