LM3S1636_13 Datasheet, PDF (424/655 Pages) Texas Instruments – Stellaris Microcontroller

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Universal Asynchronous Receivers/Transmitters (UARTs)
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 424 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 301) should be set to choose the UART function. For more information on configuring GPIOs,
see “General-Purpose Input/Outputs (GPIOs)” on page 280.
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.
424
July 24, 2012
Texas Instruments-Production Data