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Which of the following registers offers high impedance?

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Which of the following registers offers high impedance?

(a) data register

(b) data direction register

(c) individual control bit

(d) data register and data direction register

This question was posed to me in an interview for job.

Origin of the question is Parallel Ports in portion Basic Peripherals of Embedded Systems

1 Answer

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Best answer
Right answer is (c) individual control bit

The best explanation: The register which offers high impedance is the individual control bit or the third register which can be implemented by switching off both the buffers and putting their connections to the pin which offers high impedance.

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