Thanks for the C lesson, mea culpa. I've done the fix that you suggested
but SLEEP(); still does not behave. I haven't checked if the compiler
version is buggy. Some more testing is called for...

Matt Bonner wrote:
>
> Antonio L Benci wrote:
> >
> > I am trying, so far in vain, to write some code for a 12C509 device
> > which has to do the following (shown in pseudo C code):
> >
> >         Power on Device Reset;
> >
> > main{
> >     TRISB(0b11111100);
> >     CLEAR GPWU; CLEAR GPPU;
> >
> >     switch (RESET_CAUSE()) {
> >             case NORMAL_POWER_UP:   GP0=0, GP1-1;
> >             case MCLR_FROM_SLEEP:   GP0=1, GP1-0;
> >             case default:           error_handle();
> >             }
>
> Your switch statement is always going to fall through to the default
> error_handle function.
>
> You need a "break" statement in each of the case levels:
>
>  switch (RESET_CAUSE())
>     {
>     case NORMAL_POWER_UP:
>         GP0=0, GP1-1;
>         break;
>     case MCLR_FROM_SLEEP:
>         GP0=1, GP1-0;
>         break;
>     case default:
>         error_handle();
>         break;
>     }
>
> The last break is not necessary but, unless you're really tight on code
> space, it's good to put it in for clarity.
>
> --Matt

Nino.
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