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TM4C1290NCPDT: Modification of RTS on enabled UART

Part Number: TM4C1290NCPDT

Hello,

the datasheet Rev. B states in section 16.6 (UART/Register description):

| Note: The UARTCTL register should not be changed while the UART is enabled or else the results
| are unpredictable.

Does this include the RTS bit (#11)

| 11  RTS  RW  0 Request to Send   When RTSEN is clear, the status of this bit is reflected on the U1RTS, signal. If RTSEN is set, this bit is ignored on a write and should be ignored

too?  E.g. have I to disable the UART before I can change RTS, or is this allowed while UART is running?  (RTSEN is off).