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  • How are you connecting the the '328p's UART? I don't think you will get 9 bits through the '16u2 USB-serial chip on the Uno unless you modify its firmware, and you'd have to see how to get the USB side of things to support it. Your functional description isn't very clear either, but it sounds like you would need to modify the serial receive ISR away from the usual Arduino one. On the other hand, if what you want is for the Uno to be a bridge between some serial device and a PC, you will actually need to use and modify a software serial implementation or use a Leonardo instead of Uno. Commented May 31, 2016 at 14:55