I have a question about Atmega168 and 328p timer/counter modules, specifically the interrupt handlers. In

http://www.nerdkits.com/forum/thread/786/

forum thread Mike advises to “1) Change the name of the interrupt handler from SIGNAL(SIG_OUTPUT_COMPARE0A) to the new notation ISR(TIMER2_COMPA_vect).” I was unable to get my code that worked fine on a 168 to run on a 328p without changing the interrupt handlers to the new notation. Other than the fact that one handler is using the #0 timer and the other is using the #2 timer what is the difference between these two notations?

ISR(TIMER2_COMPA_vect).

SIGNAL(SIG_OUTPUT_COMPARE0A)

Am I missing something or is this a bit of code that may not be completely interchangeable between the two chips? More specifically why did the SIGNAL(SIG_OUTPUT_COMPARE0A) not seam to work when I loaded it on to a ATmega 328P?

Darryl

Bretm has a good answer on this thread - http://www.nerdkits.com/forum/thread/1447/