Arduino bootloader

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i presume when reset taken low, arduino resets , starts running special bootstrap code which, amongst other things, uses pins d0 , d1 serial transmissions can upload new user code.

that means in user code free use d0 , d1 please , , not affect bootloader in way, since after reset pressed pins return control of bootloader.

but means must careful how wire pins because if example permanently pull them high via external resistor, or if connect them low resistance, affect serial communications on.

am right in above?

yes, yes , yes.


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