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Section 20 Controller Area Network
Page 996 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
MBC[2:0] (Mailbox Configuration): These bits configure the nature of each Mailbox as follows.
When MBC = 111 (Bin), the Mailbox is inactive, i.e., it does not receive or transmit a message
regardless of TXPR or other settings. The MBC = '110', '101' and '100' settings are prohibited.
When the MBC is set to any other value, the LAFM field becomes available. Please don't set
TXPR when MBC is set as reception as there is no hardware protection, and TXPR will remain
set. MBC[1] of Mailbox-0 is fixed to "1" by hardware. This is to ensure that MB0 cannot be
configured to transmit Messages.
MBC[2] MBC[1] MBC[0]
Data
Frame
Transmit
Remote
Frame
Transmit
Data
Frame
Receive
Remote
Frame
Receive Remarks
0 0 0 Yes Yes No No
Not allowed for Mailbox-0
Time-Triggered
transmission can be used
0 0 1 Yes Yes No Yes
Can be used with ATX*
Not allowed for Mailbox-0
LAFM can be used
0 1 0 No No Yes Yes
Allowed for Mailbox-0
LAFM can be used
0 1 1 No No Yes No
Allowed for Mailbox-0
LAFM can be used
1 0 0 Setting prohibited
1 0 1 Setting prohibited
1 1 0 Setting prohibited
1 1 1 Mailbox inactive (Initial value)
Notes: * In order to support automatic retransmission, RTR shall be "0" when MBC = 001(bin)
and ATX = 1.
When ATX = 1 is used the filter for IDE must not be used.