USART, which stands for Universal Synchronous/Asynchronous Receiver/Transmitter, is a communication protocol that combines features of both synchronous and asynchronous communication. USART is often found in microcontrollers and other integrated circuits to facilitate serial communication between devices.
Key features and characteristics of the USART protocol:
1. Synchronous and Asynchronous Modes:
One of the distinguishing features of USART is its ability to operate in both synchronous and asynchronous modes. In synchronous mode, communication is synchronized using a shared clock signal, while in asynchronous mode, communication is timed by start and stop bits.
2. Baud Rate:
Similar to UART, USART uses a configurable baud rate for communication. The baud rate determines the speed of data transmission and is specified in bits per second (bps).
3. Start and Stop Bits:
USART supports the use of start and stop bits in asynchronous mode. These bits frame the data bits in each transmitted byte.
4.
Data Frame Configuration:
USART allows the configuration of the data frame, including the number of data bits (typically 8 bits), the number of stop bits (1 or 2), and the optional use of a parity bit for error checking.
5. Full-Duplex Communication:
USART is designed for full-duplex communication, meaning that data can be transmitted and received simultaneously. It has separate lines for transmitting (TX) and receiving (RX).
6. Half-Duplex Mode:
While USART is primarily intended for full-duplex communication, it can also operate in half-duplex mode if needed.
7. Master-Slave Configuration:
Like UART, USART does not inherently define a master or slave device. Devices connected using USART are often considered peers, but the master-slave relationship can be defined based on the application.
8. Flow Control:
USART supports hardware flow control using additional control lines, such as RTS (Request to Send) and CTS (Clear to Send). Flow control helps manage data flow between devices to prevent data loss.
9. Clock Source:
In synchronous mode, USART requires a clock source to synchronize communication. The clock source can be internal or external, providing flexibility in system design.
10. Applications:
USART is commonly used in microcontrollers for various applications, including serial communication between microcontrollers, interfacing with peripherals like sensors and displays, and communication with other devices like PCs or other microcontrollers.
11. Error Detection and Correction:
USART can provide error detection using parity bits, allowing the detection of odd or even numbers of bit errors in a transmitted byte.
USART provides flexibility for both synchronous and asynchronous communication, making it suitable for a wide range of applications. Its ability to operate in full-duplex mode and support various configurations makes it a popular choice in embedded systems and microcontroller-based designs.
Leave A Comment
You must be logged in to post a comment.