When it comes to RMW, it should only be a problem with
regards to pins configed as analog input. They always
(also in SIM) reads as "0". SIM doesn't have any timing
issues as when you have a pin connected to something
physical that delays the switch (capacitive load). I do
not think that SIM can simulate capacitive loads.

The code as-is simulates perfectly well in MPLAB8/MPSIM.

For clearity and to not have to check the datasheet, it
it better to use the correct register to banksel :

....
banksel TRISA
movlw   b'00000111'   ; Tried both 6 and 7
movwf   ADCON1
....

In this case TRISA and ADCON1 happends to be in the
same bank. Maybe you knew that, I didn't and had to
check with the datasheet...

 > > I had a lot of misterious problem...

RMW issues can always be explained. :-)


Jan-Erik.


G=E1l Zsolt wrote 2012-08-20 09:38:
> Hello,
>
> I would say first, I never used mplabx simulator.
> Your problem with example could be according the READ-MODIFY-WRITE
> sequence. I used to define a shadow register in the shared area to
> avoid this problem.
> I had a lot of misterious problem before I started to use shadow
> register. Here is a simple example to showing it:
>
> ...
>
> SHADOWREGISTERS  UDATA_SHR
>
> PORTAOUT   res 1
>
> ...
>
> banksel PORTA
>
> bsf    PORTAOUT,0
> movf  PORTAOUT,w
> movwf PORTA
>
> bsf    PORTAOUT,1
> movf  PORTAOUT,w
> movwf  PORTA
>
> ...
>
--=20
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