Question

Why initially all keys are considered open before detecting the key pressed?

(a) to make the task easy

(b) to remove the errors caused by other pressing keys during detection

(c) to remove the flow problems

(d) none of the mentioned

I have been asked this question during a job interview.

This key question is from Keyboard Interfacing in chapter AVR Microcontroller of Microcontroller

Answer 1

Correct choice is (b) to remove the errors caused by other pressing keys during detection

Easy explanation: Initially all keys are considered open in order to ensure the accuracy while identification of the pressed key.