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70353C датащи(PDF) 6 Page - Microchip Technology |
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70353C датащи(HTML) 6 Page - Microchip Technology |
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6 / 76 page ![]() dsPIC33E/PIC24E Family Reference Manual DS70353C-page 21-6 © 2008-2011 Microchip Technology Inc. 21.2.3 Remote Frame A node expecting to receive data from another node can initiate transmission of the respective data by the source node, by sending a remote frame. A remote frame can be in the standard format (Figure 21-6) or the extended format (Figure 21-7). A Remote frame is similar to a data frame, with the following exceptions: • The RTR bit is recessive (RTR = 1) • There is no Data field • The value of the DLC bits is 0 ≤ DLC ≤ 8 Figure 21-6: Format of the Standard Remote Frame Figure 21-7: Format of the Extended Remote Frame SID10 SID1 S O F IDENTIFIER 11 Bits R T R I D E DLC 4 Bits CRC 16 Bits ACK 2 Bits EOF 7 Bits IFS 3 Bits SID0 11-bit Identifier RB0 IDE is Dominant (Logical ‘0’) RTR is Recessive (Logical ‘1’) RB0 is Dominant (Logical ‘0’) Arbitration Field Control Field CRC Field ACK Field End-of-Frame (EOF) SID10 SID0 S O F IDENTIFIER 11 Bits S R R I D E R T R DLC 4 Bits CRC 16 Bits ACK 2 Bits EOF 7 Bits IFS 3 Bits SID1 Arbitration Field 29-bit Identifier Control Field CRC Field IDENTIFIER 18 Bits EID17 EID1 EID0 R B 1 R B 0 IDE is Recessive (Logical ‘1’) SRR is Recessive (Logical ‘1’) RTR is Recessive (Logical ‘1’) RB0 is Dominant (Logical ‘0’) RB1 is Dominant (Logical ‘0’) ACK Field End-of-Frame (EOF) |
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