SH7058 Datasheet, PDF (570/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

16.3.2 Message Control Field
Register Name
MBx[0], MBx[1]*
Address
Bit
H'100 + N×32 15
Bit Name

14 STDID
to 4 [10:0]
3 RTR
2 IDE
1, 0 EXTID
[17:16]
MBx[2], MBx[3]* H'102 + N×32 15 EXTID
to 0 [15:0]
Note: * x/N: 0 to 31 (Indicates the mailbox number)
Description
Reserved
The write value should be 0. The read
value is not guaranteed.
Standard ID
Set the ID (standard ID) of data frames
and remote frames.
Remote Transmission Request
Distinguishes between data frames and
remote frames. This bit is overwritten by
receive CAN frames depending on data
frames or remote frames.
Important: Note that, when the ATX bit
is set with the setting MBC = 001 the
RTR bit cannot be set. When a remote
frame is received, the host CPU can be
notified by the corresponding RFPR or
IRR2 (remote frame request interrupt),
however, as the HCAN needs to transmit
the current message as a data frame, the
RTR bit remains 0.
0: Data frame
1: Remote frame
ID Extension
Distinguishes between the standard
format and extended format of CAN data
frames and remote frames.
0: Standard format
1: Extended format
Extended ID
Set the ID (extended ID) of data frames
and remote frames.
Rev. 3.0, 09/04, page 529 of 1086