Transmission Interrupt Enable Register
| TFFE | TX-FIFO full detection interrupt enable bit |
| TFEE | TX-FIFO and shift register empty detection interrupt enable bit |
| TFOE | TX-FIFO overrun detection interrupt enable bit |
| TFUE | TX-FIFO underrun detection interrupt enable bit |
| TFLETE | TX-FIFO-less-than-or-equal-to-threshold detection interrupt enable bit |
| TFMTE | TX-FIFO-exceeded-threshold detection interrupt enable bit |
| TSSRE | Slave select released detection interrupt enable bit |