SH7047 Datasheet, PDF (522/764 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTMRISC engine Family/SH7000 Series

will start and proceed normally. In such a case, however, incorrect clearing of the transmit wait
register (TXPR) and setting of the flag in the abort acknowledge register (ABACK) may occur.
• Transmitting cancellation of mailbox 31 cannot be performed by event trigger transmit.
Note: Mailbox 31 should be used for reception.
15.8.13 Setting and Cancellation of Transmission during Bus-Idle State
After a transmission request has been issued (TXPR is set) while in the bus-idle state, if another
transmission request is issued (TXPR is set) or the transmission is cancelled (TXCR is set)
immediately before the SOF, transmission may not be carried out correctly.
Software Measure:
• Program so that the TXPR bits are set by package to all the mail boxes that require
transmission wait until the transmission from all of the specified mailboxes is completed,
confirm that the TXPR has been cleared to 0, then set the TXPR again.
• To cancel transmission, allow more than 50 µs after the TXPR register has been set, then set
the TXCR.
The values of the time interval from TXPR setting to TXCR setting, indicated above, is for a
guide. For further details, please contact your nearest Renesas Technology sales office.
15.8.14 Releasing HCAN2 Reset
Before releasing HCAN2 software reset mode (MCR0 = 0), confirm in advance that the reset
status bit (GSR3) is set to 1.
15.8.15 Accessing Mailboxes When HCAN2 Is in Sleep Mode
Mailboxes should not be accessed when the HCAN2 is in sleep mode. If mailboxes are accessed in
sleep mode, the CPU may stop. However, the CPU does not stop when registers that are not
relevant to mailboxes are accessed in sleep mode or mailboxes are accessed in other modes.
15.8.16 Module Standby Mode Setting
HCAN2 operation can be disabled or enabled using the module standby control register. The
initial setting is for HCAN2 operation to be halted. Register access is enabled by clearing module
standby mode. For details, refer to section 24, Power-Down Modes.
Rev. 2.00, 09/04, page 482 of 720