2 remote frame -50, Figure 4-9. remote frame -50, Figure 4-10. error frame -50 – Maxim Integrated MAXQ7666 User Manual
Page 180: Figure 4-11. overload frame -50, 2 remote frame
MAXQ7665/MAXQ7666 User’s Guide
4-50
4.3.1.2 Remote Frame
(Standard and extended format.) The remote frame is transmitted by a CAN controller to request the transmission of the data frame
with the same identifier (Figure 4-9). The remote frame is composed of seven fields, which include start of frame, arbitration field, con-
trol field, data field, CRC field, acknowledge field, and end of frame.
The remote frame is used when a CAN processor wishes to request data from another node. Sending a remote frame initiates a trans-
mission of data from a source node with the same identifier (masked groups included). The primary bit pattern difference between a
data frame and a remote frame is the RTR bit. In the remote frame, the RTR bit is sent as a recessive bit; in the data frame, the RTR bit
is sent as a dominant bit. Additionally, the remote frame does not contain a data field, independent of the programmed values in the
DTBYC3:DTBYC0 bits in the respective CAN message format register.
Figure 4-9. Remote Frame
S
O
F
ARBITRATION FIELD
REMOTE FRAME
ACK
FIELD
INTERFRAME SPACE
OR OVERLOAD FRAME
END OF
FRAME
CONTROL FIELD
CRC FIELD
INTERFRAME
SPACE
Figure 4-10. Error Frame
SUPERPOSITION OF ERROR FLAGS FROM OTHER NODES
ERROR FLAG
ERROR
DELIMITER
ERROR FRAME
INTERFRAME SPACE
OR OVERLOAD FRAME
DATA FRAME
Figure 4-11. Overload Frame
OVERLOAD FRAME
SUPERPOSITION OF OVERLOAD FLAGS FROM OTHER NODES
END OF FRAME OR
ERROR DELIMITER OR
OVERLOAD DELIMITER
OVERLOAD FLAG
OVERLOAD
DELIMITER
INTERFRAME SPACE
OR OVERLOAD FRAME
Maxim Integrated