LM3S300-IQN25-C2 Datasheet, PDF (323/498 Pages) Texas Instruments – Stellaris LM3S300 Microcontroller

NRND: Not recommended for new designs.
Stellaris^® LM3S300 Microcontroller
10.1 Block Diagram
Figure 10-1. 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
.
.
.
UnTx
Transmitter
Receiver
UnRx
10.2
Signal Description
Table 10-1 on page 323 lists the external signals of the UART module and describes 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 240) should be set to choose the UART function. For more information on configuring GPIOs,
see “General-Purpose Input/Outputs (GPIOs)” on page 222.
Table 10-1. UART Signals (48QFP)
Pin Name
Pin Number Pin Type Buffer Type^a Description
U0Rx
17
I
TTL
UART module 0 receive.
U0Tx
18
O
TTL
UART module 0 transmit.
U1Rx
27
I
TTL
UART module 1 receive.
U1Tx
28
O
TTL
UART module 1 transmit.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
June 18, 2012
323
Texas Instruments-Production Data