i am using ATmega168.i interfaced ADE7758 ic to my MCU.i am getting some problems in INT0 interrupt.i initialized the INT0 interrupt for fallling Edge trigger. i enabled the internal pull-up in the PD2 pin.before getting the interrupt i am getting 5v in the INT0 pin.after executing the interrupt one time i am not getting 5V in that pin.i am getting 0v constantly in that one.
what may be the problem.the code is below
PORTD=(1<<PD2);//pull-up for INT0
if any body knows please let me know.....