LM3S101 Datasheet, PDF (302/445 Pages) List of Unclassifed Manufacturers – Microcontroller

Universal Asynchronous Receivers/Transmitters (UARTs)
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 302 and Table 10-2 on page 302 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 219) should be set to choose the UART function. For more information
on configuring GPIOs, see “General-Purpose Input/Outputs (GPIOs)” on page 199.
Table 10-1. UART Signals (28SOIC)
Pin Name
Pin Number Pin Type Buffer Type^a Description
U0Rx
11
I
TTL
UART module 0 receive.
U0Tx
12
O
TTL
UART module 0 transmit.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
Table 10-2. UART Signals (48QFP)
Pin Name
U0Rx
Pin Number
17
Pin Type
I
Buffer Type^a Description
TTL
UART module 0 receive.
302
July 14, 2014
Texas Instruments-Production Data