SH7261 Datasheet, PDF (899/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 19 Controller Area Network (RCAN-ET) [R5S72611] [R5S72613]
19.6.5 Reconfiguration of Mailbox
When re-configuration of Mailboxes is required, the following procedures should be taken.
(1) 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 = B'000. 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 RCAN-ET 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 RCAN-ET will not be able to receive/transmit
messages during the Halt state.
In case RCAN-ET 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.
(2) Change configuration (ID, RTR, IDE, LAFM, Data, DLC, NMC, ATX, DART) of
receive box or Change receive box to transmit box
The configuration can be changed only in Halt Mode.
RCAN-ET will not lose a message if the message is currently on the CAN bus and RCAN-ET is a
receiver. RCAN-ET will be moving into Halt Mode after completing the current reception. Please
note that it might take longer if RCAN-ET is receiving or transmitting a message (as the transition
to the halt state is delayed until the end of the reception/transmission), and also RCAN-ET will not
be able to receive/transmit messages during the Halt Mode.
In case RCAN-ET is in the Bus Off state the transition to halt mode depends on the configuration
of the bit 6 and 14 of MCR.
Rev. 2.00 Sep. 07, 2007 Page 867 of 1312
REJ09B0320-0200