SH7280 Datasheet, PDF (1102/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 22 Controller Area Network (RCAN-ET) (SH7286 Only)
22.4.5 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 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.
• 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.
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. 1.00 Jun. 26, 2008 Page 1072 of 1692
REJ09B0393-0100