Transmitter interrupt set request
| TRIGGER | Write with ‘1’ to set corresponding bit in interrupt request register. |
| NOT_FULL | Write with ‘1’ to set corresponding bit in interrupt request register. |
| EMPTY | Write with ‘1’ to set corresponding bit in interrupt request register. |
| OVERFLOW | Write with ‘1’ to set corresponding bit in interrupt request register. |
| UNDERFLOW | Write with ‘1’ to set corresponding bit in interrupt request register. |
| BLOCKED | Write with ‘1’ to set corresponding bit in interrupt request register. |
| UART_NACK | Write with ‘1’ to set corresponding bit in interrupt request register. |
| UART_DONE | Write with ‘1’ to set corresponding bit in interrupt request register. |
| UART_ARB_LOST | Write with ‘1’ to set corresponding bit in interrupt request register. |