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Can I replace Atmega8 with Atmega328 in my freeduino board? If so, let me know the steps needed.

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Shouldn't be a problem. Some later versions already have a ATMega168 instead of the ATMega8. All three are pin-compatible.

In the arduino IDE you should however select a different board (one with a 328, like the UNO). That way the compiler knows the target MCU is the 328, and not the 8.

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    Not all registers are the same though. But the arduino platform takes care of these difference for you.
    – Gerben
    Jan 19, 2015 at 14:30

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