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Reference.org
Universal synchronous and asynchronous receiver-transmitter
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<p>A universal synchronous and asynchronous receiver-transmitter (USART, programmable communications interface or PCI) is a type of a serial interface device that can be programmed to communicate asynchronously or synchronously. See <a href="/facts/Universal_asynchronous_receiver-transmitter/xMntJcsI">universal asynchronous receiver-transmitter</a> (UART) for a discussion of the asynchronous capabilities of these devices. </p>