LM3S1637 Datasheet, PDF (429/696 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S1637 Microcontroller
12.1 Block Diagram
Figure 12-1. UART Module Block Diagram
System Clock
Interrupt
Identification
Registers
UARTPCellID0
UARTPCellID1
UARTPCellID2
UARTPCellID3
UARTPeriphID0
UARTPeriphID1
UARTPeriphID2
UARTPeriphID3
UARTPeriphID4
UARTPeriphID5
UARTPeriphID6
UARTPeriphID7
Interrupt Control
UARTIFLS
UARTIM
UARTMIS
UARTRIS
UARTICR
UARTDR
Control/Status
UARTRSR/ECR
UARTFR
UARTLCRH
UARTCTL
UARTILPR
TxFIFO
16 x 8
.
.
.
Baud Rate
Generator
UARTIBRD
UARTFBRD
RxFIFO
16 x 8
.
.
.
Transmitter
(with SIR
Transmit
Encoder)
UnTx
Receiver
(with SIR
Receive
Decoder)
UnRx
12.2
Signal Description
Table 12-1 on page 429 and Table 12-2 on page 430 list the external signals of the UART module
and describe the function of each. The UART signals are alternate functions for some GPIO signals
and default to be GPIO signals at reset, with the exception of the U0Rx and U0Tx pins which default
to the UART function. The column in the table below titled "Pin Assignment" lists the possible GPIO
pin placements for these UART signals. The AFSEL bit in the GPIO Alternate Function Select
(GPIOAFSEL) register (page 305) should be set to choose the UART function. For more information
on configuring GPIOs, see “General-Purpose Input/Outputs (GPIOs)” on page 283.
Table 12-1. UART Signals (100LQFP)
Pin Name
U0Rx
Pin Number
26
Pin Type
I
U0Tx
27
O
U1Rx
12
I
Buffer Type^a Description
TTL
UART module 0 receive. When in IrDA mode, this signal has
IrDA modulation.
TTL
UART module 0 transmit. When in IrDA mode, this signal has
IrDA modulation.
TTL
UART module 1 receive. When in IrDA mode, this signal has
IrDA modulation.
June 18, 2012
429
Texas Instruments-Production Data