LM3S1H11 Datasheet, PDF (694/956 Pages) Texas Instruments – Stellaris® LM3S1H11 Microcontroller

Universal Asynchronous Receivers/Transmitters (UARTs)
Register 1: UART Data (UARTDR), offset 0x000
Important: This register is read-sensitive. See the register description for details.
This register is the data register (the interface to the FIFOs).
For transmitted data, if the FIFO is enabled, data written to this location is pushed onto the transmit
FIFO. If the FIFO is disabled, data is stored in the transmitter holding register (the bottom word of
the transmit FIFO). A write to this register initiates a transmission from the UART.
For received data, if the FIFO is enabled, the data byte and the 4-bit status (break, frame, parity,
and overrun) is pushed onto the 12-bit wide receive FIFO. If the FIFO is disabled, the data byte and
status are stored in the receiving holding register (the bottom word of the receive FIFO). The received
data can be retrieved by reading this register.
UART Data (UARTDR)
UART0 base: 0x4000.C000
UART1 base: 0x4000.D000
UART2 base: 0x4000.E000
Offset 0x000
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
OE
BE
PE
FE
DATA
Type RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:12
11
Name
reserved
OE
Type
RO
RO
Reset Description
0x0000.0
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.
0
UART Overrun Error
Value Description
1 New data was received when the FIFO was full, resulting in
data loss.
0 No data has been lost due to a FIFO overrun.
10
BE
RO
0
UART Break Error
Value Description
1 A break condition has been detected, indicating that the receive
data input was held Low for longer than a full-word transmission
time (defined as start, data, parity, and stop bits).
0 No break condition has occurred
In FIFO mode, this error is associated with the character at the top of
the FIFO. When a break occurs, only one 0 character is loaded into the
FIFO. The next character is only enabled after the received data input
goes to a 1 (marking state), and the next valid start bit is received.
694
January 23, 2012
Texas Instruments-Production Data