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Section 20 Controller Area Network
R01UH0134EJ0400 Rev. 4.00 Page 1075 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
20.4.5 Reconfiguration of Mailbox
When re-configuration of Mailboxes is required, the following procedures should be taken.
Change configuration of transmit box
Two cases are possible.
Change of ID, RTR, IDE, LAFM, Data, DLC, NMC, ATX, DART
This change is possible only when MBC = 3'b000. Confirm that the corresponding TXPR
is not set. The configuration (except MBC bit) can be changed at any time.
Change from transmit to receive configuration (MBC)
Confirm that the corresponding TXPR is not set. The configuration can be changed only in
Halt or reset state. Please note that it might take longer for this module to transit to halt
state if it is receiving or transmitting a message (as the transition to the halt state is delayed
until the end of the reception/transmission), and also this module will not be able to
receive/transmit messages during the Halt state.
In case this module is in the Bus Off state the transition to halt state depends on the
configuration of the bit 6 of MCR and also bit and 14 of MCR.
Change configuration (ID, RTR, IDE, LAFM, Data, DLC, NMC, ATX, DART, MBC) of
receiver box or Change receiver box to transmitter box
The configuration can be changed only in Halt Mode.
This module will not lose a message if the message is currently on the CAN bus and this
module is a receiver. This module will be moving into Halt Mode after completing the current
reception. Please note that it might take longer if this module is receiving or transmitting a
message (as the transition to the halt state is delayed until the end of the
reception/transmission), and also this module will not be able to receive/transmit messages
during the Halt Mode.
In case this module is in the Bus Off state the transition to halt mode depends on the
configuration of the bit 6 and 14 of MCR.