Graynomad:
If you only have one then by definition the interrupt comes form that pin and there's no need to figure anything
Bah! Where's the fun in that!
@BroHogan...
The ability to detect rising and falling would be great too!
Call attachPcInterrupt in exactly the same fashion as attachInterrupt (LEVEL interrupts are not supported)...
void Rising( void )
{
digitalWrite( 2, ! digitalRead( 2 ) );
}
void setup( void )
{
attachPcInterrupt( 1, Rising, RISING );
}
The code is available here...
http://code.google.com/p/arduino-tiny/downloads/detail?name=PinChangeInterrupt-0001.zip
The readme.txt file is very sparse. I simply don't have time to write up install / usage instructions. If you get stuck, ask here for help.
The serial sounds interesting
Some instruction here (I'll try to get 16 MHz support published this weekend)...
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1285218245/25#25
Good luck and please let me know how you make out!