28.4 Register SummaryOffsetNameBit Pos.765432100x00CTRLA7:0 DORDMASTERCLK2X PRESC[1:0]ENABLE0x01CTRLB7:0BUFENBUFWR SSDMODE[1:0]0x02INTCTRL7:0RXCIETXCIEDREIESSIE IE0x03INTFLAGS7:0IFWRCOL 0x03INTFLAGS7:0RXCIFTXCIFDREIFSSIF BUFOVF0x04DATA7:0DATA[7:0]