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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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transfers its data or generates an interrupt indicating a remote frame was requested. This can be
strictly a single message identifier, or it can be a range of values specified in the message object.
The CAN mask registers, CANIFnMSKn, configure which groups of frames are identified as remote
frame requests. The UMASK bit in the CANIFnMCTL register enables the MSK bits in the
CANIFnMSKn register to filter which frames are identified as a remote frame request. The MXTD
bit in the CANIFnMSK2 register should be set if a remote frame request is expected to be triggered
by 29-bit extended identifiers.
14.2.3 Transmitting Message Objects
If the internal transmit shift register of the CAN module is ready for loading, and if there is no data
transfer occurring between the CAN Interface Registers and message RAM, the valid message
object with the highest priority that has a pending transmission request is loaded into the transmit
shift register by the message handler and the transmission is started. The message object's NEWDAT
bit in the CANNWDAn register is cleared. After a successful transmission, and if no new data was
written to the message object since the start of the transmission, the TXRQST bit in the CANTXRQn
register is cleared. If the CAN controller is set up to interrupt upon a successful transmission of a
message object, (the TXIE bit in the CAN IFn Message Control (CANIFnMCTL) register is set),
the INTPND bit in the CANIFnMCTL register is set after a successful transmission. If the CAN
module has lost the arbitration or if an error occurred during the transmission, the message is
re-transmitted as soon as the CAN bus is free again. If, meanwhile, the transmission of a message
with higher priority has been requested, the messages are transmitted in the order of their priority.
14.2.4 Configuring a Transmit Message Object
The following steps illustrate how to configure a transmit message object.
1. In the CAN IFn Command Mask (CANIFnCMASK) register:
Set the WRNRD bit to specify a write to the CANIFnCMASK register; specify whether to
transfer the IDMASK, DIR, and MXTD of the message object into the CAN IFn registers using
the MASK bit
Specify whether to transfer the ID, DIR, XTD, and MSGVAL of the message object into the
interface registers using the ARB bit
Specify whether to transfer the control bits into the interface registers using the CONTROL
bit
Specify whether to clear the INTPND bit in the CANIFnMCTL register using the CLRINTPND
bit
Specify whether to clear the NEWDAT bit in the CANNWDAn register using the NEWDAT bit
Specify which bits to transfer using the DATAA and DATAB bits
2. In the CANIFnMSK1 register, use the MSK[15:0] bits to specify which of the bits in the 29-bit
or 11-bit message identifier are used for acceptance filtering. Note that MSK[15:0] in this
register are used for bits [15:0] of the 29-bit message identifier and are not used for an 11-bit
identifier. A value of 0x00 enables all messages to pass through the acceptance filtering. Also
note that in order for these bits to be used for acceptance filtering, they must be enabled by
setting the UMASK bit in the CANIFnMCTL register.
June 22, 2010368
Texas Instruments-Production Data
Controller Area Network (CAN) Module
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