> I'm sure others will chime in with a better response. Here is my super
> tired, on the way to bed answer.
> 
> When you get an interrupt, you check the flags of the interrupts you
> are interested in. look for the xxxIF flags. Remember, you have to
> clear those flags too.
> 
> Josh

Note that this allows for (something like) priority in interrupt
handling, even in 12- and 14-bit core chips.  Multiple simultaneous
interrupts will be serviced in the order they are checked.  Any
interrupt NOT serviced will cause an immediate return to the interrupt
vector upon RETFIE.  This doesn't mean that a lower priority interrupt
can be interrupted by a higher priority interrupt, just that more time
critical ones can be allowed to finish their business before less time
critical ones.

Also remember that not all interrupt flags are cleared by clearing
their respective flag; for example, USART interrupt flags are cleared
by taking the appropriate action on the involved register (writing
TXREG, reading RCREG).

Mike H.
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