LM3S9781_15 Datasheet, PDF (702/1271 Pages) Texas Instruments – Stellaris LM3S9781 Microcontroller

Universal Asynchronous Receivers/Transmitters (UARTs)
Bit/Field
2:0
Name
TXIFLSEL
Type
R/W
Reset
0x2
Description
UART Transmit Interrupt FIFO Level Select
The trigger points for the transmit interrupt are as follows:
Value Description
0x0 TX FIFO ≤ ⅞ empty
0x1 TX FIFO ≤ ¾ empty
0x2 TX FIFO ≤ ½ empty (default)
0x3 TX FIFO ≤ ¼ empty
0x4 TX FIFO ≤ ⅛ empty
0x5-0x7 Reserved
Note:
If the EOT bit in UARTCTL is set (see page 697), the transmit
interrupt is generated once the FIFO is completely empty and
all data including stop bits have left the transmit serializer. In
this case, the setting of TXIFLSEL is ignored.
702
July 03, 2014
Texas Instruments-Production Data