LM3S1150 Luminary Micro, Inc, LM3S1150 Datasheet - Page 269
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LM3S1150
Manufacturer Part Number
LM3S1150
Description
Lm3s1150 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1150.pdf
(513 pages)
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12.2.7
12.2.8
12.3
July 26, 2008
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All of the interrupt events are ORed together before being sent to the interrupt controller, so the
UART can only generate a single interrupt request to the controller at any given time. Software can
service multiple interrupt events in a single interrupt service routine by reading the UART Masked
Interrupt Status (UARTMIS) register (see page 290).
The interrupt events that can trigger a controller-level interrupt are defined in the UART Interrupt
Mask (UARTIM ) register (see page 287) by setting the corresponding IM bit to 1. If interrupts are
not used, the raw interrupt status is always visible via the UART Raw Interrupt Status (UARTRIS)
register (see page 289).
Interrupts are always cleared (for both the UARTMIS and UARTRIS registers) by setting the
corresponding bit in the UART Interrupt Clear (UARTICR) register (see page 291).
The receive timeout interrupt is asserted when the receive FIFO is not empty, and no further data
is received over a 32-bit period. The receive timeout interrupt is cleared either when the FIFO
becomes empty through reading all the data (or by reading the holding register), or when a 1 is
written to the corresponding bit in the UARTICR register.
Loopback Operation
The UART can be placed into an internal loopback mode for diagnostic or debug work. This is
accomplished by setting the LBE bit in the UARTCTL register (see page 283). In loopback mode,
data transmitted on UnTx is received on the UnRx input.
IrDA SIR block
The IrDA SIR block contains an IrDA serial IR (SIR) protocol encoder/decoder. When enabled, the
SIR block uses the UnTx and UnRx pins for the SIR protocol, which should be connected to an IR
transceiver.
The SIR block can receive and transmit, but it is only half-duplex so it cannot do both at the same
time. Transmission must be stopped before data can be received. The IrDA SIR physical layer
specifies a minimum 10-ms delay between transmission and reception.
Initialization and Configuration
To use the UARTs, the peripheral clock must be enabled by setting the UART0, UART1, or UART2
bits in the RCGC1 register.
This section discusses the steps that are required to use a UART module. For this example, the
UART clock is assumed to be 20 MHz and the desired UART configuration is:
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Parity Error
Framing Error
Receive Timeout
Transmit (when condition defined in the TXIFLSEL bit in the UARTIFLS register is met)
Receive (when condition defined in the RXIFLSEL bit in the UARTIFLS register is met)
115200 baud rate
Data length of 8 bits
One stop bit
Preliminary
LM3S1150 Microcontroller
269
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