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During receiving operation what does URXD have?

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During receiving operation what does URXD have?

(a) Positive edge

(b) Negative edge

(c) Level edge

(d) Either raising or falling edge

This question was addressed to me in an interview.

My question is taken from USART Protocol in division Internet Principles of IOT

1 Answer

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The correct answer is (a) Positive edge

The explanation is: The receive operation is initiated by the receipt of a valid start bit. It consists of a negative edge at URXD, followed by the taking of majority vote from three samples, where 2 of the samples must be zero.

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