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Which type of device may be used to interface a parallel data format with external equipment’s serial format?

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Answer & Explanation

Correct AnswerA. UART

Quick Explanation

A UART is designed to interface parallel data used inside a digital system with asynchronous serial data used on an external communication link. It performs parallel-to-serial transmission and serial-to-parallel reception.

Formula / Key Relation

Parallel data ⇄ UART ⇄ serial data

Detailed Explanation

Concept & Reasoning

UART stands for Universal Asynchronous Receiver/Transmitter. On transmit, the processor writes a parallel byte and the UART frames and shifts it serially. On receive, incoming serial bits are sampled and assembled into a parallel byte, usually with start/stop bits and optional parity.

How to Solve It in the Exam

Parallel inside, serial outside → UART.

Important Exam Point

Remember UART handles framing and conversion; it is not just a shift register.

Related Revision Path

This question sits in the revision path Digital Electronics → Data Communication Interfaces → Serial/Parallel Conversion .

Quick Trick

Parallel inside, serial outside → UART.

Common Mistake

Selecting a SIPO register alone; a UART also manages asynchronous communication framing.

Exam Tip

Remember UART handles framing and conversion; it is not just a shift register.

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Exam Path

Knowledge Path

Study concept · UART →Practice concept Practice topic

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