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Bootloader hardware requirements

Question asked by Danielyan.Varuzhan on Mar 15, 2014
Latest reply on Mar 15, 2014 by Clive One
In the AN2606 11.2 Bootloader hardware requirements, one can read:
"The RX pins of the peripheral unused in this bootloader have to be kept at a known (low
or high) level, and should not be left floating during the detection phase".
Usually we connect pins not directly to GND or VCC, but with resistors.
The question: what is the maximal value or resistance, not to be recognized as "floating"?