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P912XDP512F0MFVR 数据表(PDF) 461 Page - Freescale Semiconductor, Inc |
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P912XDP512F0MFVR 数据表(HTML) 461 Page - Freescale Semiconductor, Inc |
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461 / 1350 page  Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3) MC9S12XDP512 Data Sheet, Rev. 2.17 Freescale Semiconductor 461 • Four identifier acceptance filters, each to be applied to — a) the 14 most significant bits of the extended identifier plus the SRR and IDE bits of CAN 2.0B messages or — b) the 11 bits of the standard identifier, the RTR and IDE bits of CAN 2.0A/B messages. Figure 10-41 shows how the first 32-bit filter bank (CANIDAR0–CANIDA3, CANIDMR0–3CANIDMR) produces filter 0 and 1 hits. Similarly, the second filter bank (CANIDAR4–CANIDAR7, CANIDMR4–CANIDMR7) produces filter 2 and 3 hits. • Eight identifier acceptance filters, each to be applied to the first 8 bits of the identifier. This mode implements eight independent filters for the first 8 bits of a CAN 2.0A/B compliant standard identifier or a CAN 2.0B compliant extended identifier. Figure 10-42 shows how the first 32-bit filter bank (CANIDAR0–CANIDAR3, CANIDMR0–CANIDMR3) produces filter 0 to 3 hits. Similarly, the second filter bank (CANIDAR4–CANIDAR7, CANIDMR4–CANIDMR7) produces filter 4 to 7 hits. • Closed filter. No CAN message is copied into the foreground buffer RxFG, and the RXF flag is never set. Figure 10-40. 32-bit Maskable Identifier Acceptance Filter ID28 ID21 IDR0 ID10 ID3 IDR0 ID20 ID15 IDR1 ID2 IDE IDR1 ID14 ID7 IDR2 ID10 ID3 IDR2 ID6 RTR IDR3 ID10 ID3 IDR3 AC7 AC0 CANIDAR0 AM7 AM0 CANIDMR0 AC7 AC0 CANIDAR1 AM7 AM0 CANIDMR1 AC7 AC0 CANIDAR2 AM7 AM0 CANIDMR2 AC7 AC0 CANIDAR3 AM7 AM0 CANIDMR3 ID Accepted (Filter 0 Hit) CAN 2.0B Extended Identifier CAN 2.0A/B Standard Identifier |
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