the chip worked well before with internal oscillator.
I have connected an external crystal and accordingly I have changed the FUSE bits.
Here i got the problem.
does the chip go bad if i modify the FUSE bits?
I am getting confusion in setting the FUSE bits.Can you send me some tutorial for selecting the FUSE Bits.I am using CodeVision AVR compiler.
Which version of Codevision are you using? There´s no confusion in bits selection. When they are cleared they become a "1", so you need to mark only the ones (place a "x" in the box) you want to become a "0". If you´re using an extermal xtal don´t forget to place small caps (10 to 22pF) to GND from either pin.