Dear Evert,
The DS1307 runs on 5 volt. But its inputs / outputs are open drain and vinhigh is 2.2 volt. so connecting it to a micro of 3.3 volt works.
Thank you for suggesting a non programming possibility.
I am suspecting my micro itself. its xmega revision shows 4. which is too old, I think. Mark has said to use of ver 7 or higher.
I purchased it from a shop in Singapor. ( I am from India).
Regards,
Devidas
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