For applications where the I/O pin connection to the application circuitry is rather long, what external protection measures should be taken?
Answer The I/O pins have Schmitt trigger inputs, also the inputs have protection diodes between the pin and VDD and VSS. As a result the noise rejection capabilities of the devices is high, however to reduce the possibility of noise interference yet further, it is recommended that a resistor is placed in series with the I/O pin.
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