RE: [avr-gcc-list] external interrupt use

[Uccelli Danilo]

Jamie Morken wrote :

> Sent: Tuesday, February 24, 2004 3:59 AM
 
> I have 6 digital signals that I need to be able to trigger an 
> interrupt on
> the falling edge and rising edge for all of them, but I am 
> short 2 external
> interrupts.  Is there a simple way to detect the 6 signals 
> rising/falling
> edges with 4 interrupts and some additional circuitry?  I 
> have thought about
> using diodes to AND some of the signals but this only works 
> for positive
> edges I think.

Some AVR devices like ATmega64 provide 8 external interrupts and they are
edge programables moreover some pins are even programable to generate an
interrupt on pin change.

HTH, Danilo

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