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LM3S8530-IQR80-C1

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型号: LM3S8530-IQR80-C1
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  • LM3S8530-IQR80-C1 PDF文件
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功能描述: Stellaris® LM3S8530 Microcontroller
PDF文件大小: 4249.13 Kbytes
PDF页数: 共526页
制造商: TI[Texas Instruments]
制造商LOGO: TI[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝LM3S8530-IQR80-C1
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120%
or active error flag), the bit is rerouted internally so that the CAN Controller monitors this dominant
bit, although the CAN bus remains in recessive state.
14.2.13.2 Loopback Mode
Loopback mode is useful for self-test functions. In Loopback Mode, the CAN Controller internally
routes the CANnTX signal on to the CANnRX signal and treats its own transmitted messages as
received messages and stores them (if they pass acceptance filtering) into the message buffer. The
CAN Controller is put in Loopback Mode by setting the LBACK bit in the CANTST register. To be
independent from external stimulation, the CAN Controller ignores acknowledge errors (a recessive
bit sampled in the acknowledge slot of a data/remote frame) in Loopback Mode. The actual value
of the CANnRX signal is disregarded by the CAN Controller. The transmitted messages can be
monitored on the CANnTX signal.
14.2.13.3 Loopback Combined with Silent Mode
Loopback Mode and Silent Mode can be combined to allow the CAN Controller to be tested without
affecting a running CAN system connected to the CANnTX and CANnRX signals. In this mode, the
CANnRX signal is disconnected from the CAN Controller and the CANnTX signal is held recessive.
This mode is enabled by setting both the LBACK and SILENT bits in the CANTST register.
14.2.13.4 Basic Mode
Basic Mode allows the CAN Controller to be operated without the Message RAM. In Basic Mode,
The CANIF1 registers are used as the transmit buffer. The transmission of the contents of the IF1
registers is requested by setting the BUSY bit of the CANIF1CRQ register. The CANIF1 registers
are locked while the BUSY bit is set. The BUSY bit indicates that a transmission is pending. As soon
the CAN bus is idle, the CANIF1 registers are loaded into the shift register of the CAN Controller
and transmission is started. When the transmission has completed, the BUSY bit is cleared and the
locked CANIF1 registers are released. A pending transmission can be aborted at any time by clearing
the BUSY bit in the CANIF1CRQ register while the CANIF1 registers are locked. If the CPU has
cleared the BUSY bit, a possible retransmission in case of lost arbitration or an error is disabled.
The CANIF2 Registers are used as a receive buffer. After the reception of a message, the contents
of the shift register is stored into the CANIF2 registers, without any acceptance filtering. Additionally,
the actual contents of the shift register can be monitored during the message transfer. Each time a
read message object is initiated by setting the BUSY bit of the CANIF2CRQ register, the contents
of the shift register are stored into the CANIF2 registers.
In Basic Mode, all message-object-related control and status bits and of the control bits of the
CANIFnCMSK registers are not evaluated. The message number of the CANIFnCRQ registers is
also not evaluated. In the CANIF2MCTL register, the NEWDATand MSGLSTbits retain their function,
the DLC[3:0] field shows the received DLC, the other control bits are cleared.
Basic Mode is enabled by setting the BASIC bit in the CANTST register.
14.2.13.5 Transmit Control
Software can directly override control of the CANnTX signal in four different ways.
CANnTX is controlled by the CAN Controller
The sample point is driven on the CANnTX signal to monitor the bit timing
CANnTX drives a low value
June 22, 2010376
Texas Instruments-Production Data
Controller Area Network (CAN) Module
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