LM3S9B92_11 Datasheet, PDF (679/1386 Pages) Texas Instruments – Stellaris LM3S9B92 Microcontroller

Stellaris® LM3S9B92 Microcontroller
Table 13-2. Signals for UART (108BGA) (continued)
Pin Name
Pin Number Pin Mux / Pin Pin Type Buffer Type^a Description
Assignment
U1CTS
A1
PE6 (9)
I
G1
PD0 (9)
L6
PA6 (9)
M10
PJ3 (9)
TTL
UART module 1 Clear To Send modem status input
signal.
U1DCD
B1
PE7 (9)
I
G2
PD1 (9)
M6
PA7 (9)
K11
PJ4 (9)
TTL
UART module 1 Data Carrier Detect modem status
input signal.
U1DSR
M9
PF0 (9)
I
K12
PJ5 (9)
TTL
UART module 1 Data Set Ready modem output
control line.
U1DTR
L12
PJ7 (9)
O
A2
PD7 (9)
TTL
UART module 1 Data Terminal Ready modem
status input signal.
U1RI
B5
PD4 (9)
I
TTL
UART module 1 Ring Indicator modem status input
signal.
U1RTS
L10
PJ6 (9)
O
H12
PF1 (9)
TTL
UART module 1 Request to Send modem output
control line.
U1Rx
G1
PD0 (5)
I
H2
PD2 (1)
M2
PC6 (5)
L3
PA0 (9)
E12
PB0 (5)
A6
PB4 (7)
TTL
UART module 1 receive. When in IrDA mode, this
signal has IrDA modulation.
U1Tx
G2
PD1 (5)
O
H1
PD3 (1)
L2
PC7 (5)
M3
PA1 (9)
D12
PB1 (5)
B7
PB5 (7)
TTL
UART module 1 transmit. When in IrDA mode, this
signal has IrDA modulation.
U2Rx
G1
PD0 (4)
I
K1
PG0 (1)
A6
PB4 (4)
C6
PD5 (9)
TTL
UART module 2 receive. When in IrDA mode, this
signal has IrDA modulation.
U2Tx
B2
PE4 (5)
O
G2
PD1 (4)
K2
PG1 (1)
A3
PD6 (9)
TTL
UART module 2 transmit. When in IrDA mode, this
signal has IrDA modulation.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
13.3
Functional Description
Each Stellaris UART performs the functions of parallel-to-serial and serial-to-parallel conversions.
It is similar in functionality to a 16C550 UART, but is not register compatible.
The UART is configured for transmit and/or receive via the TXE and RXE bits of the UART Control
(UARTCTL) register (see page 703). Transmit and receive are both enabled out of reset. Before any
control registers are programmed, the UART must be disabled by clearing the UARTEN bit in
UARTCTL. If the UART is disabled during a TX or RX operation, the current transaction is completed
prior to the UART stopping.
The UART module also includes a serial IR (SIR) encoder/decoder block that can be connected to
an infrared transceiver to implement an IrDA SIR physical layer. The SIR function is programmed
using the UARTCTL register.
March 19, 2011
679
Texas Instruments-Advance Information