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P912XDP512F0MPVR 数据表(PDF) 451 Page - Freescale Semiconductor, Inc |
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P912XDP512F0MPVR 数据表(HTML) 451 Page - Freescale Semiconductor, Inc |
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451 / 1348 page  Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3) MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 451 Table 10-25. IDR0 Register Field Descriptions — Extended Field Description 7:0 ID[28:21] Extended Format Identifier — The identifiers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the most significant bit and is transmitted first on the CAN bus during the arbitration procedure. The priority of an identifier is defined to be highest for the smallest binary number. 76543210 R ID20 ID19 ID18 SRR (=1) IDE (=1) ID17 ID16 ID15 W Reset: xxxxxxxx Figure 10-27. Identifier Register 1 (IDR1) — Extended Identifier Mapping Table 10-26. IDR1 Register Field Descriptions — Extended Field Description 7:5 ID[20:18] Extended Format Identifier — The identifiers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the most significant bit and is transmitted first on the CAN bus during the arbitration procedure. The priority of an identifier is defined to be highest for the smallest binary number. 4 SRR Substitute Remote Request — This fixed recessive bit is used only in extended format. It must be set to 1 by the user for transmission buffers and is stored as received on the CAN bus for receive buffers. 3 IDE ID Extended — This flag indicates whether the extended or standard identifier format is applied in this buffer. In the case of a receive buffer, the flag is set as received and indicates to the CPU how to process the buffer identifier registers. In the case of a transmit buffer, the flag indicates to the MSCAN what type of identifier to send. 0 Standard format (11 bit) 1 Extended format (29 bit) 2:0 ID[17:15] Extended Format Identifier — The identifiers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the most significant bit and is transmitted first on the CAN bus during the arbitration procedure. The priority of an identifier is defined to be highest for the smallest binary number. 76543210 R ID14 ID13 ID12 ID11 ID10 ID9 ID8 ID7 W Reset: xxxxxxxx Figure 10-28. Identifier Register 2 (IDR2) — Extended Identifier Mapping Table 10-27. IDR2 Register Field Descriptions — Extended Field Description 7:0 ID[14:7] Extended Format Identifier — The identifiers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the most significant bit and is transmitted first on the CAN bus during the arbitration procedure. The priority of an identifier is defined to be highest for the smallest binary number. |
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