UART is an abbreviation for Universal Asynchronous Receiver/Transmitter. It is a computer hardware chip for data communications that gives a computer the ability to have a serial interface system. The chip not only changes the parallel data of the computer into serial, or one-bit-at-a-time, data and vice versa, but is also programmable. This enables the communication rate to be chosen, as well as the error checking system ('parity') to be used, the number of bits used to represent each character ('data bits'), and the number of 'stop bits' which will mark the end of each character.
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