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CP3SP33SMS/NOPB Datasheet(PDF) 183 Page - Texas Instruments |
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CP3SP33SMS/NOPB Datasheet(HTML) 183 Page - Texas Instruments |
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183 / 407 page  GMASK1 11111111 00000000 GMASK2 00000 00000000 BUFFER_ID1 10101010 10101010 BUFFER_ID2 10101 10101010 XXXXXXXX 10101010 Accepted ID Group 10101 10101010 DS034 GMASK1 00000000 00000000 GMASK2 00000 00000000 BUFFER_ID1 10101010 10101010 BUFFER_ID2 10101 10101010 10101010 10101010 Accepted ID 10101 10101010 DS033 CP3SP33 www.ti.com SNOSCW5 – MAY 2013 This provides the capability to accept only a single ID for each buffer or to accept a group of IDs. The following two examples illustrate the difference. 22.4.1 Example 1: Acceptance of a Single Identifier If the global mask is loaded with 00h, the acceptance filtering of an incoming message is only determined by the individual buffer ID. This means that only one message ID is accepted for each buffer. Figure 22-16. Acceptance of a Single Identifier 22.4.2 Example 2: Reception of an Identifier Group Set bits in the global mask register change the corresponding bit status within the buffer ID to “don’t care” (X). Messages which match the non-“don’t care” bits (the bits corresponding to clear bits in the global mask register) are accepted. Figure 22-17. Acceptance of a Group of Identifiers A separate filtering path is used for buffer 14. For this buffer, acceptance filtering is established by the buffer ID in conjunction with the basic filtering mask. This basic mask uses the same method as the global mask (set bits correspond to “don’t care” bits in the buffer ID). Therefore, the basic mask allows a large number of infrequent messages to be received by this buffer. NOTE If the BMASK register is equal to the GMASK register, the buffer 14 can be used the same way as the buffers 0 to 13. The buffers 0 to 13 are scanned prior to buffer 14. Subsequently, the buffer 14 will not be checked for a matching ID when one of the buffers 0 to 13 has already received an object. Copyright © 2013, Texas Instruments Incorporated Dual CAN Interfaces 183 Submit Documentation Feedback Product Folder Links :CP3SP33 |
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