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M16C/29 датащи(PDF) 330 Page - Renesas Technology Corp |
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M16C/29 датащи(HTML) 330 Page - Renesas Technology Corp |
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330 / 499 page ![]() 17. CAN Module p u o r G 9 2 / C 6 1 M page 306 8 5 4 f o 7 0 0 2 , 0 3 .r a M 2 1 . 1 . v e R 2 1 1 0 - 1 0 1 0 B 9 0 J E R 17.5 Acceptance Filter Support Unit (ASU) The acceptance filter support unit has a function to judge valid/invalid of a received ID through table search. The IDs to receive are registered in the data table; a received ID is stored in the C0AFS register, and table search is performed with a decoded received ID. The acceptance filter support unit can be used for the IDs of the standard frame only. The acceptance filter support unit is valid in the following cases. • When the ID to receive cannot be masked by the acceptance filter. (Example) IDs to receive: 07816, 08716, 11116 • When there are too many IDs to receive; it would take too much time to filter them by software. Figure 17.23 shows the write and read of the C0AFS register in word access. Figure 17.23 Write/read of C0AFS Register in Word Access bit 15 bit 0 When read SID10 SID9 SID8 SID7 SID6 SID5 SID4 SID3 bit 15 bit 0 SID10 SID9 SID8 SID7 SID6 SID5 SID4 SID3 SID2 SID1 SID0 When write 3/8 Decoder 24216 24216 Address CAN0 bit 8 bit 7 bit 8 bit 7 |
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