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Which is true in interfacing 7 segment code display?

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in Microprocessor by (39.3k points)
Which is true in interfacing 7 segment code display?

(a) transmitted by second port

(b) display is selected by third port

(c) display is selected by second port

(d) none of the mentioned

I have been asked this question in an interview for job.

The above asked question is from Interfacing With 8051 Ports -2 topic in portion Microcontroller 8051 of Microprocessor

1 Answer

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by (49.2k points)
The correct answer is (c) display is selected by second port

Explanation: The 7-segment code of a digit is transmitted by the first port and the display is selected by second port. As soon as the display is selected by the second port, the digit starts glowing on that display position.

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