Universal Asynchronous Receiver/Transmitter (UART) is the most common point to point (peer) serial communication interface used in microcontrollers. It is a simple two-wire interface that requires no clock signal or any master device for serial transmission of data between two embedded devices. It can transmit data packets of variable length (5 to 9 bits) with the provision of a parity bit for error detection. That is why almost all microcontrollers have USART or at least UART peripheral built-in.
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