In this modern world we all are aware about USB. We all connect our Pen drives, memory card and other devices using USB. But have you ever thought what is it? Here is the answer; USB is a communication protocol by which two devices communicate with each other. In the same way, microcontroller also communicates with other devices like sensors or PC by using different communication protocols like USB, UART, and I2C.UART stands for Universal Asynchronous Receiver/Transmitter. It is a type of serial communication that uses two wires, one for transmission (Tx) and one for reception (Rx).
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