Transmission Interrupt Clear Register
| TFFC | TX-FIFO full detection clear bit |
| TFEC | TX-FIFO and shift register empty detection clear bit |
| TFOC | TX-FIFO overrun detection clear bit |
| TFUC | TX-FIFO underrun detection clear bit |
| TFLETC | TX-FIFO-less-than-or-equal-to-threshold detection clear bit |
| TFMTC | TX-FIFO-exceeded-threshold detection clear bit |
| TSSRC | Slave select released detection clear bit |