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How to set AVR to select external crystal for clock?

A _delay_ms(1000) is producing a quick beep however it should produce 1 sec beep if it is operating on 12Mhz.

Could it be done programatically of it needs to be set using fuses?

I am using 33pf capacitor on crystal.

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Reset to default
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Got these on atmega162 datasheet , it helped me and i got solution enter image description here enter image description here

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