::Interrupt isr()
:: {
::        PORTC = 0x01;
::        PORTC = 0x00;

</snip>

With what are you checking the port toggle?  Is it possible that it's 
happening so fast (in human terms) that you're missing it.

To just check the interrupt is working why not change the PortC part 
to an XOR that way for the moment it will only toggle one state change 
per interrupt.

I haven't checked, but does PortA need any further direction setting 
up for the comparator to work?

You are not testing for the CFG flag(s) so do you have any other 
interrupts that could be upsetting things?

Colin
--
cdb, colin@btech-online.co.uk on 3/17/2010
 
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