Mauricio wrote ...

> Hmmm... I think that controlling 5V logic with 3V will work OK, but what if
> you need to read something from this 5V device by a 3V PIC? Isn't there a
> chance to blow something (from the datasheets, PIC I/O pins are rated
> to max. Vdd+0.6V)?

Add a resistor between these I/O pins to limit current flow. The value should
be low enough to enable 3v I/O -> 5v I/O and high enough to limit
current flow into the PIC I/O pin.
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Conny Andersson / LiTH