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Naive question about AVR processors.

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Folks, I have been playing a bit with Atmega328 and ATtiny processors, but in trying to understand them, it would help a lot if I can get the answer to a really basic question : When a brand new, unprogrammed AVR processor is powered on for the first time, what does it do?

Computers I have worked with in the past, when powered on, did basically one thing : they started executing instructions, starting at memory location zero.

Now the reason why I ask about the AVR :
I bought a Teensy2 -...

Naive question about AVR processors.

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