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M16C/1N датащи(PDF) 161 Page - Renesas Technology Corp |
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M16C/1N датащи(HTML) 161 Page - Renesas Technology Corp |
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161 / 238 page ![]() Rev.1.00 Oct 20, 2004 page 149 of 222 M16C/1N Group 16. CAN Module REJ09B0007-0100Z 16.8 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 16.22 shows the write and read of C0AFS register in word access. Figure 16.22 Write/read of CiAFS Register in Word Access Bit 15 Bit 0 Bit 8 Bit 7 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 Bit 8 Bit 7 When write 3/8 Decoder 024516, 024416 024516, 024416 Address |
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