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What does UART stand for?

UART stands for Universal Asynchron Receiver Transmitter

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A UART (Universal Asynchronous Receiver/Transmitter) is the microchip with programming that controls a computer's interface to its attached serial devices.
A USART (Universal Synchronous/Asynchronous Receiver/Transmitter) is a microchip that facilitates communication through a computer's serial port using the RS-232C protocol.
The universal asynchronous receiver/transmitter (UART) takes bytes of data and transmits the individual bits in a sequential fashion. [1] At the destination, a second UART re-assembles the bits into complete bytes. Each UART contains a shift register, which is the fundamental method of conversion between serial and parallel forms. Serial transmission of digital information (bits) through a single wire or other medium is less costly than parallel transmission through multiple wires.
Neben dem eigentlichen UART existieren weitere, auf dem UART basierende, Schnittstellenbausteine. Übliche Bezeichnungen sind DUART, die Abkürzung steht für Dual Universal Asynchronous Receiver Transmitter, der zwei UARTs in einem einzelnen Mikrochip kombiniert. USART (Aussprache: ???sat oder 'ju sart) steht für Universal Synchronous/Asynchronous Receiver Transmitter und bietet zusätzlich die Möglichkeit einer synchronen Datenübertragung.