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Section 20 Controller Area Network
R01UH0134EJ0400 Rev. 4.00 Page 993 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
(1) Message Control Field
STDID[10:0]: These bits set the identifier (standard identifier) of data frames and remote frames.
EXTID[17:0]: These bits set the identifier (extended identifier) of data frames and remote frames.
RTR (Remote Transmission Request bit): Used to distinguish between data frames and remote
frames. This bit is overwritten by received CAN Frames depending on Data Frames or Remote
Frames.
Important: Please note that, when ATX bit is set with the setting MBC = 001(bin), the RTR bit
will never be set. When a Remote Frame is received, the CPU can be notified by the
corresponding RFPR set or IRR[2] (Remote Frame Receive Interrupt), however, as this module
needs to transmit the current message as a Data Frame, the RTR bit remains unchanged.
Important: In order to support automatic answer to remote frame when MBC = 001 (bin) is used
and ATX = 1 the RTR flag must be programmed to zero to allow data frame to be transmitted.
Note: when a Mailbox is configured to send a remote frame request the DLC used for
transmission is the one stored into the Mailbox.
RTR Description
0 Data frame
1 Remote frame
IDE (Identifier Extension bit): Used to distinguish between the standard format and extended
format of CAN data frames and remote frames.
IDE Description
0 Standard format
1 Extended format