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With the trend of the miniaturisation of the embedded system, the Minimisation requirement of I/O pins is higher and higher when the information is transmitted in the elements. Microchip has developed the Protocol UNI/O, which is a solution that is low cost and easy to implement. UNI/O only needs one I/O signal when the information is transmitted, which is convenient for reducing the size of the product greatly to accord with the trend of the system miniaturisation.