SH7147 Datasheet, PDF (705/1108 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Controller Area Network (RCAN-ET)
(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 Request Interrupt), however, as RCAN-ET
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
0
1
Description
Data frame
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
Rev. 3.00 Oct. 06, 2008 Page 681 of 1080
REJ09B0230-0300