In message  <9607292038.aa09032@device.data.co.za> Kalle Pihlajasaari writes:
> Hi Mike,
>
> > I am having difficulty getting MPSim in MPLab to detect that tmr0 on
> > a C84 has overflowed. I'm not using interrupt, just polling the bit,
> > but it never detects the bit change, even though it works in the
> > part itself.
>
> Been playing with exactly the same things the whole weekend.
>
> I have not used it with the prescaler yet but you must keep an eye
> on the interaction between the cwdt command and the prescaler, there
> may be some incorect mutual effects there.
>
> You have used the wrong flag.
>
> The rtif is used for the port B0 interrupt (selectable edge polarity in
> OPTION register) and th T0IF is used for the timer 0 overflow flag.

Okay, so I'm using an old equates file. RTIF is bit 2 of INTCON.

>
> BitLoop
>       btfss   INTCON, T0IF    ; spin on bit counter
>       goto    BitLoop
>
> The above works fine.


My problem is more a MPLab problem than a PIC problem. The code works
fine in silicon and in the dos MPSIM, but when I run it in the simultaor
in MPLab, it never leaves my equivalent of your bitloop.

I am using MPLab version 3.09.02.

It is annoying, as I have had to go back to the dos simulator to test
my code :-(

Regards,


Mike