A UART is usually an individual (or part of an) integrated circuit used for serial communications over a computer or peripheral device serial port . UARTs are now commonly included in microcontrollers. A dual UART, or DUART , combines two UARTs into a single chip. An octal UART or OCTART combines eight UARTs into one package, an example being the NXP SCC2698. Many modern ICs now come with a UART that can also communicate synchronously; these devices are called USARTs (universal synchronous/asynchronous receiver/transmitter). Programing UART in ARM Microcontrollers: you can find here: www.gadgetronicx.com
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