LM3S308 Luminary Micro, Inc, LM3S308 Datasheet - Page 267

• Manufacturer Part Number: LM3S308
• Description: Lm3s308 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Reset
Type
Type
UART Flag (UARTFR)
UART0 base: 0x4000.C000
UART1 base: 0x4000.D000
Offset 0x018
Type RO, reset 0x0000.0090
June 04, 2008
Bit/Field
31:8
RO
RO
7
6
5
31
15
0
0
RO
RO
Register 3: UART Flag (UARTFR), offset 0x018
The UARTFR register is the flag register. After reset, the TXFF, RXFF, and BUSY bits are 0, and
TXFE and RXFE bits are 1.
30
14
0
0
RO
RO
29
13
reserved
0
0
Name
TXFE
RXFF
TXFF
RO
RO
28
12
0
0
reserved
RO
RO
27
11
0
0
Type
RO
RO
RO
RO
RO
RO
26
10
0
0
RO
RO
Reset
25
0
9
0
0
1
0
0
Preliminary
RO
RO
24
0
8
0
reserved
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 Transmit FIFO Empty
The meaning of this bit depends on the state of the FEN bit in the
UARTLCRH register.
If the FIFO is disabled (FEN is 0), this bit is set when the transmit holding
register is empty.
If the FIFO is enabled (FEN is 1), this bit is set when the transmit FIFO
is empty.
UART Receive FIFO Full
The meaning of this bit depends on the state of the FEN bit in the
UARTLCRH register.
If the FIFO is disabled, this bit is set when the receive holding register
is full.
If the FIFO is enabled, this bit is set when the receive FIFO is full.
UART Transmit FIFO Full
The meaning of this bit depends on the state of the FEN bit in the
UARTLCRH register.
If the FIFO is disabled, this bit is set when the transmit holding register
is full.
If the FIFO is enabled, this bit is set when the transmit FIFO is full.
TXFE
RO
RO
23
0
7
1
RXFF
RO
RO
22
0
6
0
TXFF
RO
RO
21
0
5
0
RXFE
RO
RO
20
0
4
1
BUSY
RO
RO
19
0
3
0
LM3S308 Microcontroller
RO
RO
18
0
2
0
reserved
RO
RO
17
0
1
0
RO
RO
16
0
0
0
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