LM3S600 Bookham Technology, Inc., LM3S600 Datasheet - Page 234
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LM3S600
Manufacturer Part Number
LM3S600
Description
Microcontroller
Manufacturer
Bookham Technology, Inc.
Datasheet
1.LM3S600.pdf
(378 pages)
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Universal Asynchronous Receivers/Transmitters (UARTs)
UART Interrupt FIFO Level Select (UARTIFLS)
UART0 base: 0x4000.C000
UART1 base: 0x4000.D000
Offset 0x034
Type R/W, reset 0x0000.0012
234
Reset
Reset
Type
Type
Bit/Field
31:6
5:3
RO
RO
31
15
0
0
Register 8: UART Interrupt FIFO Level Select (UARTIFLS), offset 0x034
The UARTIFLS register is the interrupt FIFO level select register. You can use this register to define
the FIFO level at which the TXRIS and RXRIS bits in the UARTRIS register are triggered.
The interrupts are generated based on a transition through a level rather than being based on the
level. That is, the interrupts are generated when the fill level progresses through the trigger level.
For example, if the receive trigger level is set to the half-way mark, the interrupt is triggered as the
module is receiving the 9th character.
Out of reset, the TXIFLSEL and RXIFLSEL bits are configured so that the FIFOs trigger an interrupt
at the half-way mark.
RO
RO
30
14
0
0
RXIFLSEL
reserved
Name
RO
RO
29
13
0
0
RO
RO
28
12
0
0
RO
RO
Type
27
11
R/W
0
0
RO
reserved
RO
RO
26
10
0
0
Reset
0x00
0x2
RO
RO
25
0
9
0
Preliminary
Description
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.
UART Receive Interrupt FIFO Level Select
The trigger points for the receive interrupt are as follows:
RO
RO
0x5-0x7
24
0
8
0
Value
reserved
0x0
0x1
0x2
0x3
0x4
RO
RO
23
0
7
0
Description
RX FIFO ≥ 1/8 full
RX FIFO ≥ ¼ full
RX FIFO ≥ ½ full (default)
RX FIFO ≥ ¾ full
RX FIFO ≥ 7/8 full
Reserved
RO
RO
22
0
6
0
R/W
RO
21
0
5
0
RXIFLSEL
R/W
RO
20
0
4
1
R/W
RO
19
0
3
0
R/W
RO
18
0
2
0
October 01, 2007
TXIFLSEL
R/W
RO
17
0
1
1
R/W
RO
16
0
0
0
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