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P912XDP512F0MFVR 数据表(PDF) 452 Page - Freescale Semiconductor, Inc |
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P912XDP512F0MFVR 数据表(HTML) 452 Page - Freescale Semiconductor, Inc |
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452 / 1350 page  Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3) MC9S12XDP512 Data Sheet, Rev. 2.17 452 Freescale Semiconductor 10.3.3.1.2 IDR0–IDR3 for Standard Identifier Mapping 76543210 R ID6 ID5 ID4 ID3 ID2 ID1 ID0 RTR W Reset: xxxxxxxx Figure 10-29. Identifier Register 3 (IDR3) — Extended Identifier Mapping Table 10-28. IDR3 Register Field Descriptions — Extended Field Description 7:1 ID[6:0] 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. 0 RTR Remote Transmission Request — This flag reflects the status of the remote transmission request bit in the CAN frame. In the case of a receive buffer, it indicates the status of the received frame and supports the transmission of an answering frame in software. In the case of a transmit buffer, this flag defines the setting of the RTR bit to be sent. 0 Data frame 1 Remote frame 76543210 R ID10 ID9 ID8 ID7 ID6 ID5 ID4 ID3 W Reset: xxxxxxxx Figure 10-30. Identifier Register 0 — Standard Mapping Table 10-29. IDR0 Register Field Descriptions — Standard Field Description 7:0 ID[10:3] Standard Format Identifier — The identifiers consist of 11 bits (ID[10:0]) for the standard format. ID10 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. See also ID bits in Table 10-30. 76543210 R ID2 ID1 ID0 RTR IDE (=0) W Reset: xxxxxxxx = Unused; always read ‘x’ Figure 10-31. Identifier Register 1 — Standard Mapping |
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