USART interrupt flag clear register
| PECF | Parity error clear flag |
| FECF | Framing error clear flag |
| NECF | Noise detected clear flag |
| ORECF | Overrun error clear flag |
| IDLECF | Idle line detected clear flag |
| TXFECF | TXFIFO empty clear flag |
| TCCF | Transmission complete clear flag |
| TCBGTCF | Transmission complete before Guard time clear flag |
| LBDCF | LIN break detection clear flag |
| CTSCF | CTS clear flag |
| RTOCF | Receiver timeout clear flag |
| EOBCF | End of block clear flag |
| UDRCF | SPI slave underrun clear flag |
| CMCF | Character match clear flag |
| WUCF | Wakeup from low-power mode clear flag |