Question

To identify that which key is being pressed, we need to:

a.

ground all the pins of the port at a time.

b.

ground pins of the port one at a time

c.

connect all the pins of the port to the main supply at a time.

d.

none of the mentioned

Posted under 8051 Microcontroller Computer Architecture

Answer: (b).ground pins of the port one at a time

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Q. To identify that which key is being pressed, we need to:

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