Synchronous communication and asynchronous communication are two different communication methods. Their main differences are as follows:
- Synchronous communication requires that the clock frequency of the sender and the receiver are consistent, or there is a fixed time interval to transmit data, while asynchronous communication does not require clock synchronization. The sender can send data at any time, only need to add flag bits to the beginning and end of each data unit.
- Synchronous communication is more efficient because there are no extra flag bits and there is no need to wait for the receiver's response. However, synchronous communication is also more complicated, requiring small clock errors on both sides, or there is a reliable synchronization mechanism¹. Asynchronous communication is relatively simple, with high fault tolerance, but is less efficient, because the need to add flag bits may also cause data discontinuity¹.
- Synchronous communication can be used in point-to-multipoint communication scenarios, such as broadcast or multicast². Asynchronous communication is only suitable for point-to-point communication scenarios, such as serial communication².
Synchronous communication and asynchronous communication have their own advantages and disadvantages, and are suitable for different application scenarios. Generally speaking, when the data volume is large, the real-time requirement is high, and the transmission distance is short, synchronous communication can be used; when the data volume is small, the real-time requirement is low, and the transmission distance is long, asynchronous communication can be used.
UART, SPI and I2C are three common serial communication protocols. They belong to asynchronous communication, synchronous communication and synchronous communication⁴, respectively. Specifically:
- UART (Universal Asynchronous Receiver/Transmitter) is a universal asynchronous serial transceiver that allows full duplex asynchronous serial communication between two devices⁵. The UART adds the start bit and the stop bit before and after each data byte so that the receiver can identify the boundary of the data ⁵.
- SPI (Serial Peripheral Interface) is a high-speed synchronous serial peripheral interface that can perform full duplex synchronous serial communication between one master and multiple slave devices⁶. SPI uses a clock line to synchronize data transmission, and uses a chip select line to select the target slave device⁶.
- I2C (Inter-Integrated Circuit) is a low-speed synchronous serial bus that can perform half-duplex synchronous serial communication between multiple masters and multiple slaves⁷. The I2C uses a clock line and a data line to transmit data and uses the slave device's address to identify the target device⁷.
The above is my brief introduction to synchronous communication and asynchronous communication as well as UART, SPI and I2C. If you have any other questions, please continue to ask questions. 😊
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(5) What is the difference between synchronous communication and asynchronous communication? UART, SPI and I2C belong to the Cambrian written test questions respectively_Niuke.com. /questionTerminal/50ab5ceff819425d826962db8b70dd02.
(6) The difference between synchronous communication and asynchronous communication - CSDN blog. /wind19/article/details/7433249.
(7) undefined. /qq_42024067/article/details/102532842.