UART Communication Protocol - Diagram and Explanation | New Topic

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In this note, we will learn about the UART Communication Protocol, including its diagram and Explanation. Welcome to Diploma to Degree, an ultimate solution for diploma and degree engineering notes.

Author Name: Arun Paul.

UART Communication Protocol - Diagram and Explanation - diploma to degree

What is UART Communication Protocol?

The UART (Universal Asynchronous Receiver/Transmitter) Communication Protocol is a serial protocol for transferring data between two devices. It is asynchronous, which means that the transmitter and receiver do not require a clock signal to synchronize; rather, they must agree on a common baud rate.


Key Features of UART Communication Protocol

  • This is an asynchronous transmission (no clock signal).
  • It provides a full duplex communication method. (simultaneous transmission and reception)
  • Communication is point-to-point. (often between two devices).
  • It is both simple and cost-effective.
  • It just has two major wires: TX (Transmit) and RX (Receive).

UART Communication Protocol with its Diagram and Explanation

1. Transmitter side

a. Transmit Hold Register: The Transmit Hold Register temporarily stores the data that will be sent. This information is received in parallel from the processor or memory unit. The register functions as a buffer, ensuring that the data is ready and available before moving on to the next stage, the Transmit Shift Register. This buffering helps to ensure that the data is transmitted smoothly and continuously, especially when processing and transmission speeds differ.

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