A pull-up resistor is a resistor that is connected between a voltage supply and an input pin of a digital circuit, ensuring that the input pin is pulled to a high logic level when no active devices are driving it low. This helps in stabilizing the input signal, preventing it from floating and causing unpredictable behavior in the circuit. Pull-up resistors are essential for proper interfacing with switches and other digital inputs, as they ensure consistent and reliable readings.
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