Hi,

yes, it is possible to check the IT flags. However, you should reset the
flags the same way as in the ISR. To answer the question which flags are
re-set, see the following:

all the IT's have their individual enable flags (maybe associated with any
group or global flag), ending with E, e. g. INTE.

then the IT will set the associated F flag (e. g. INTF). You must evaluate
these, and reset that caused the interrupt actually. In the majority of
cases, the E and F bits are in the same register. Not always, but more and
more often ("nicht immer, aber immer šfter!").

Imre

On Wed, 26 Aug 1998, Nuno Pedrosa wrote:

> Hi! How do I deal with interrupts in PIC16x.. ?
> 
> Here's what I (think) know:
> - Single int vector in 0x0004
> - I need to check which int to handle in the routine
> 
> But, what flags are changed upon an interrupt call, and which flags are
> recovered after the int call?
> 
> >From the docs, I think it's possible to use the ints in a polling way.
> I would do this by disabling the GIE (mask off all ints) and then, in
> the code, check the individual flags.
> Is this possible?
> 
> Thank you,
> Nuno.
> 
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