On Sun, 27 Oct 1996, Chaipi Wijnbergen wrote:

> On Sat, 26 Oct 1996, NEIL GANDLER wrote:
>
> >  I am having a problem with a 16c74 program. The program
> > length has now exceeded 2K in program length, so now I must
> > manipulate the PCLATH register when performing long calls.
> > The problem occurs after I place a long call and then try to
> > return back to page0 using the RETURN command.
>
> Neil,
>
> When you are running on page 0 and calling a routine on page 1, you set
> PCLATH to point to page 1, after returning from page 1, PCLATH is still
> pointing into page 1, but, you are running in Page 0, so, for each next
> call or goto command, the PIC will try to jump to a location in Page 1.
>
> So, when you use PCLATH, you need to update it before any call that either
> jump to another page or jump to a location within the same page but after
> returning from the other page.
>
> chaipi
>
Thanks for the advice, Do I need to store and restore PCLATH before and
after interrupts?

Neil