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ST72561 Datasheet(PDF) 183 Page - STMicroelectronics |
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ST72561 Datasheet(HTML) 183 Page - STMicroelectronics |
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183 / 262 page ![]() ST72561 183/262 beCAN CONTROLLER (Cont’d) 10.9.4.4 Message Storage The interface between the software and the hard- ware for the CAN messages is implemented by means of mailboxes. A mailbox contains all infor- mation related to a message; identifier, data, con- trol and status information. Transmit Mailbox The software sets up the message to be transmit- ted in an empty transmit mailbox. The status of the transmission is indicated by hardware in the MCSR register. Transmit Mailbox Mapping Receive Mailbox When a message has been received, it is available to the software in the FIFO output mailbox. Once the software has handled the message (e.g. read it) the software must release the FIFO output mail- box by means of the RFOM bit in the CRFR regis- ter to make the next incoming message available. The filter match index is stored in the MFMI regis- ter. Receive Mailbox Mapping Offset to Transmit Mailbox base ad- dress (bytes) Register Name 0MCSR 1MDLC 2MIDR0 3MIDR1 4MIDR2 5MIDR3 6MDAR0 7MDAR1 8MDAR2 9MDAR3 10 MDAR4 11 MDAR5 12 MDAR6 13 MDAR7 14 Reserved 15 Reserved Offset to Receive Mailbox base ad- dress (bytes) Register Name 0MFMI 1MDLC 2 MIDR0 3 MIDR1 4 MIDR2 5 MIDR3 6 MDAR0 7 MDAR1 8 MDAR2 9 MDAR3 10 MDAR4 11 MDAR5 12 MDAR6 13 MDAR7 14 Reserved 15 Reserved |
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