70353C datasheet(6/76 Pages) MICROCHIP

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dsPIC33E/PIC24E Family Reference Manual

DS70353C-page 21-6

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

IDENTIFIER

11 Bits

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

IDENTIFIER

11 Bits

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

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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