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A false erasing of flash in Atmega64.

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YUV

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Hi all!

I have got a problem in Atmega64.
During power-up Atmega64 sometimes executes bootloader section wrongly and performs an erasing of a piece of the main code.
Reset circuit uses RC chain.
If someone know such problem, would you be so kind to help me to solve it? Or make a hint at least, what it could be a reason.

Thanks.
 

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