SH7261 datasheet(899/1348 Pages) RENESAS

899 / 1348 page

Section 19 Controller Area Network (RCAN-ET) [R5S72611] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 867 of 1312

REJ09B0320-0200

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.

SH7261 Datasheet(PDF) 899 Page - Renesas Technology Corp