8051 Serial Communication MCQs

Practice 8051 Serial Communication MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Microprocessors & Microcontrollers8051 Serial Communication

The 8051 serial port is commonly described as?

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Correct Answer: A. Full-duplex

Explanation: The 8051 serial interface can transmit and receive simultaneously, so it supports full-duplex communication.

Reference: Standard microprocessors and microcontrollers: 8051 serial communication

Question 2

Microprocessors & Microcontrollers8051 Serial Communication

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Correct Answer: A. SCON

Explanation: SCON is the Serial Control register and contains serial mode, receive-enable and transmit/receive flag bits.

Reference: Standard microprocessors and microcontrollers: 8051 serial communication

Question 3

Microprocessors & Microcontrollers8051 Serial Communication

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Correct Answer: A. SBUF

Explanation: Software writes transmit data to SBUF and reads received serial data from SBUF.

Reference: Standard microprocessors and microcontrollers: 8051 serial communication

Question 4

Microprocessors & Microcontrollers8051 Serial Communication

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Correct Answer: A. TI

Explanation: TI is set when a serial transmission completes according to the selected serial mode.

Reference: Standard microprocessors and microcontrollers: 8051 serial communication

Question 5

Microprocessors & Microcontrollers8051 Serial Communication

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Correct Answer: B. RI

Explanation: RI indicates that a serial data frame has been received and is ready for software handling.

Reference: Standard microprocessors and microcontrollers: 8051 serial communication