70353C Datasheet, PDF (40/76 Pages) Microchip Technology – Section 21. Enhanced Controller Area Network

Figure 21-9: Remote Frame Transmit and Response
1
Message Buffer 0
Message Buffer 1 (TX)
Message Buffer 14 (RX)
ECAN™ NODE 1
SID SRR = 1 EID RTR = 1 DLC Extended Message
SID RTR = 1 DLC
Standard Message
Remote Frame
Filter 15
Filter 0
Message Buffer 31
MASK 2
MASK 1
MASK 0
ECAN NODE 2
Filter 15
2
Filter 0
MASK 2
MASK 1
MASK 0
3 _{Message Buffer 0}
SID SRR = 0 EID RTR = 0 DLC
Message Buffer 1
SID RTR = 0 DLC
Data Frame
Message Buffer 7 (TX)
4
Message Buffer 8
Message Buffer 31
Note 1: The node transmitting the remote frame must have a transmit buffer, from which to send the remote frame, and one receive buffer to receive the data frame.
2: The node receiving the remote frame must have a transmit buffer from which to transmit a data frame in response to the received remote frame.
3: The FnBP bits (CiBUFPNTm) should be pointing to a transmit buffer in case of remote transmission.
4: The RTREN bits (CiTRmnCON) should be set so that, when a remote transmit is received, the TXREQ bits (CiTRmnCON) will be set automatically.