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LM3S6G65-IQC80-A2T

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型号: LM3S6G65-IQC80-A2T
PDF文件:
  • LM3S6G65-IQC80-A2T PDF文件
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功能描述: Stellaris® LM3S6G65 Microcontroller
PDF文件大小: 6152.12 Kbytes
PDF页数: 共1044页
制造商: TI1[Texas Instruments]
制造商LOGO: TI1[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝LM3S6G65-IQC80-A2T
PDF页面索引
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service multiple interrupt events in a single interrupt service routine by reading the UART Masked
Interrupt Status (UARTMIS) register (see page 655).
The interrupt events that can trigger a controller-level interrupt are defined in the UART Interrupt
Mask (UARTIM) register (see page 647) by setting the corresponding IM bits. If interrupts are not
used, the raw interrupt status is always visible via the UART Raw Interrupt Status (UARTRIS)
register (see page 651).
Interrupts are always cleared (for both the UARTMIS and UARTRIS registers) by writing a 1 to the
corresponding bit in the UART Interrupt Clear (UARTICR) register (see page 659).
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.
The receive interrupt changes state when one of the following events occurs:
If the FIFOs are enabled and the receive FIFO reaches the programmed trigger level, the RXRIS
bit is set. The receive interrupt is cleared by reading data from the receive FIFO until it becomes
less than the trigger level, or by clearing the interrupt by writing a 1 to the RXIC bit.
If the FIFOs are disabled (have a depth of one location) and data is received thereby filling the
location, the RXRIS bit is set. The receive interrupt is cleared by performing a single read of the
receive FIFO, or by clearing the interrupt by writing a 1 to the RXIC bit.
The transmit interrupt changes state when one of the following events occurs:
If the FIFOs are enabled and the transmit FIFO reaches the programmed trigger level, the TXRIS
bit is set. The transmit interrupt is cleared by writing data to the transmit FIFO until it becomes
greater than the trigger level, or by clearing the interrupt by writing a 1 to the TXIC bit.
If the FIFOs are disabled (have a depth of one location) and there is no data present in the
transmitters single location, the TXRIS bit is set. It is cleared by performing a single write to the
transmit FIFO, or by clearing the interrupt by writing a 1 to the TXIC bit.
13.3.10 Loopback Operation
The UART can be placed into an internal loopback mode for diagnostic or debug work by setting
the LBE bit in the UARTCTL register (see page 641). In loopback mode, data transmitted on the
UnTx output is received on the UnRx input. Note that the LBE bit should be set before the UART is
enabled.
13.3.11 DMA Operation
The UART provides an interface to the μDMA controller with separate channels for transmit and
receive. The DMA operation of the UART is enabled through the UART DMA Control
(UARTDMACTL) register. When DMA operation is enabled, the UART asserts a DMA request on
the receive or transmit channel when the associated FIFO can transfer data. For the receive channel,
a single transfer request is asserted whenever any data is in the receive FIFO. A burst transfer
request is asserted whenever the amount of data in the receive FIFO is at or above the FIFO trigger
level configured in the UARTIFLS register. For the transmit channel, a single transfer request is
asserted whenever there is at least one empty location in the transmit FIFO. The burst request is
asserted whenever the transmit FIFO contains fewer characters than the FIFO trigger level. The
single and burst DMA transfer requests are handled automatically by the μDMA controller depending
on how the DMA channel is configured.
July 24, 2012624
Texas Instruments-Production Data
Universal Asynchronous Receivers/Transmitters (UARTs)
OBSOLETE: TI has discontinued production of this device.
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