USART FIFO global control register. These registers are byte, halfword, and word addressable.The upper 16 bits of these registers provide information about the System FIFO configuration, and are specific to each device type.
| RXPAUSE | Pause all USARTs receive FIFO operations. This can be used to prepare the System FIFO to reconfigure FIFO allocations among the USART receivers. |
| RXPAUSED | All USART receive FIFOs are paused. |
| RXEMPTY | All USART receive FIFOs are empty. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| TXPAUSE | Pause all USARTs transmit FIFO operations. This can be used to prepare the System FIFO to reconfigure FIFO allocations among the USART transmitters. |
| TXPAUSED | All USART transmit FIFOs are paused. |
| TXEMPTY | All USART transmit FIFOs are empty. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| RXFIFOTOTAL | Reports the receive FIFO space available for USARTs on this FIFO. The reset value is device specific. |
| TXFIFOTOTAL | Reports the transmit FIFO space available for USARTs on this FIFO. The reset value is device specific. |