AVR SLEEP Mode Help

hi
i am using AVR atmega128 , i want to use the sleep mode for power saving
and i want to wake up device on the basis of external interrupt 5,
the interrupt works ok if i am using it in normal mode,
but when i turn the MCU to sleep mode the external interrupt does not work

please help
thank you



set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable();
sei();
sleep_mode();
// code stucks here and interrupt does now work

sleep_disable();

@ compaq
some documentation
http://www.nongnu.org/avr-libc/user-manual/group__avr__sleep.html

hi
i have seen this document before, thanks for sharing, but the problem is this i am unable to wake up device using interrupt 5, it only wakes up using interrup 0 so this was the issue.
thank you

is interrupt 5 enabled? and ATmega128 only get enabled if interrupt 5 is configured for level interrupt. check page 56 of datasheet for info on wakeup sources.