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Can you tell me more about the effects of I/O pin after power on and RESET?

Latest Updated:10/10/2008

Question:

(I/O Port)  (1) What is the state of the I/O pins after power-on and RESET?
(2) Is it possible for the RESET and I/O pins to output undefined values regardless of state if the power supply voltage exceeds the absolute maximum ratings? [2008/10/10]

Answer:

(1) If the power supply voltage is within the absolute maximum rating, the I/O pins will set to input mode and go into high impedance at RESET and power-on.
(2) Yes. If the power supply voltage exceeds the absolute maximum rating, not only may the RESET and I/O pins output undefined values, the MCU may malfunction. (#107144)
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