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A pull-up resistor is used to "pull-up" a signal to prevent it from floating or creating an undefined state. Typically a digital input might be looking for a ground or low state to indicate a state. The pull-up resistor is attached to the signal line and to a level which will "pull" the line to a high level in the absense of a low signal. The effect is to provide a reliable hi or lo to an input. The pull up may located close to an input or directly at an output to effect the results. Some eletronic devices have the pull-up devices internally installed.

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