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Which of the following is the pin efficient method of communicating between other devices?

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Which of the following is the pin efficient method of communicating between other devices?

(a) serial port

(b) parallel port

(c) peripheral port

(d) memory port

I got this question in an online interview.

My question comes from Serial Port and Serial Peripheral Interface in portion Basic Peripherals of Embedded Systems

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Best answer
Correct answer is (a) serial port

Explanation: The serial ports are considered to be the pin efficient method of communication between other devices within an embedded system.

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