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Which error occurs when UART transmitter has completed sending a character and the transmit buffer is empty?

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Which error occurs when UART transmitter has completed sending a character and the transmit buffer is empty?

(a) Overrun error

(b) Underrun error

(c) Framing error

(d) Break condition

The question was asked in an internship interview.

This intriguing question originated from UART Protocol in portion Internet Principles of IOT

1 Answer

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The correct option is (b) Underrun error

To explain: An Under run error occurs when UART transmitter has completed sending a character and the transmit buffer is empty. In asynchronous mode this is treated as an indication that no data remains to be transmitted.

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