These status bits are in the Channel_sts register.
•TACTIVE: Transmitter state machine active status. If in an active state, the transmitter is currently shifting out a character.
•RACTIVE: Receiver state machine active status. If in an active state, the receiver is has detected a start bit and is currently shifting in a character.
•FLOWDEL: Receiver flow delay trigger continuous status. The FLOWDEL status bit is used to monitor the RxFIFO level in comparison with the flow delay trigger level.