LM3S1626_16 Datasheet, PDF (480/724 Pages) Texas Instruments – Stellaris LM3S1626 Microcontroller

Universal Asynchronous Receivers/Transmitters (UARTs)
Bit/Field
3
2:0
Name
BUSY
reserved
Type
RO
RO
Reset
0
0
Description
UART Busy
When this bit is 1, the UART is busy transmitting data. This bit remains
set until the complete byte, including all stop bits, has been sent from
the shift register.
This bit is set as soon as the transmit FIFO becomes non-empty
(regardless of whether UART is enabled).
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
480
July 17, 2014
Texas Instruments-Production Data