Thanks BAJ! I fixed it.
Regards
Miki


Byron A Jeff wrote:

> On Mon, Oct 08, 2001 at 10:01:41PM +0300, Michael Noel wrote:
> > Hi all!
> >
> > Where PIC16F877 returns from an interrupt, if in ISR I worked with
> > PCLATH in
> > different pages?
>
> Back to where it started. PCLATCH is not used for the return from interrupt.
> The entire address is stored on the stack.
>
> > If the program  loop in page 2 and appear an  interrupt
> > the PCLATH
> > and PCL  registers have 00 and 04?
>
> Nope. The PCLATCH register is unchanged during an interrupt. If the ISR needs
> to change it, it should save the original and restore it before leaving. Of
> course this applies to the W and STATUS registers also.
>
> > The program jump to 0004 without
> > 'programer
> > intervention' ,
>
> Correct. An interrupt when enabled will goto address 0004.
>
> > I mean clrf PCLATH instruction?
>
> No the PCLATCH will be unaffected. So you'd have to save the PCLATCH, change it
> and restore it before the retfie.
>
> > And to  a 'retfie'
> > instruction where will
> > jump the program?
>
> Back to the instruction where the interrupt occured.
>
> > How can I simulate an RB0 INT in Mplab 5.20? With Asynchronous Stimulus
> > don't work!
>
> No clue. I use gpsim on my Linux box.
>
> Hope this helps,
>
> BAJ
>
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