h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 729

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

(10) HCAN Transmit Procedure
When transmission is set while the bus is in the idle state, if the next transmission is set or the set
transmission is canceled under the following conditions within 50 s, the transmit message ID of
being set may be damaged.
Make whichever setting shown below to avoid the message IDs from being damaged.
Table 16-6 Interval Limitation between TXPR and TXPR or between TXPR and TXCR
(11) Canceling HCAN Reset and HCAN Sleep
Before canceling the software reset or sleep mode for HCAN (MCR0 = 0 or MCR5 = 0), confirm
that the reset status bit (GSR3) is set to 1.
(12) Accessing Mailbox in HCAN Sleep Mode
The mailboxes should not be accessed in HCAN sleep mode. If mailboxes are accessed in HCAN
sleep mode, the CPU may stop. When registers are accessed in HCAN sleep mode, the CPU does
not stop. When mailboxes are accessed in modes other than sleep mode, the CPU does not stop.
Baud Rate (bps)
1 M
500 k
250 k
•
When the second transmission has the message whose priority is higher than the first one.
When the message of the highest priority is canceled in the first transmission.
Set transmission in one TXPR. After transmission of all transmit messages is completed, set
transmission again (mass transmission setting). The interval between transmission settings
should be 50 s or longer.
Make the transmission setting according to the priority of transmit messages.
Set the interval to be 50 s or longer between TXPR and another TXPR or between TXPR and
TXCR.
Clear the messages awaiting transmission by resetting the HCAN module during bus off
status. To reset the HCAN module, set and then clear the module stop bits (MSTPC3 and
MSTPC2 in MSTPCRC). Note that this will reset all internal values in the HCAN module,
so it will be necessary to perform the initial settings once again.
Set Interval ( s)
50
50
50
Section 16 Controller Area Network (HCAN)
Rev. 6.00 Feb 22, 2005 page 669 of 1484
REJ09B0103-0600