h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 708

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

Section 16 Controller Area Network (HCAN)
Mailbox (Message Control/Data (MCx[x], MDx[x]) Initial Settings: After power is supplied,
all registers and RAM (message control/data, control registers, status registers, etc.) are initialized.
Message control/data (MCx[x], MDx[x]) only are in RAM, and so their values are undefined.
Initial values must therefore be set in all the mailboxes (by writing 0s or 1s).
Setting the Message Transmission Method: Either of the following message transmission
methods can be selected with the message transmission method bit (MCR2) in the master control
register (MCR):
a. Transmission order determined by message identifier priority
b. Transmission order determined by mailbox number priority
When a is selected, if a number of messages are designated as waiting for transmission (TXPR =
1), the message with the highest priority set in the message identifier (MCx[5] to MCx[8]) is
stored in the transmit buffer. CAN bus arbitration is then carried out for the message in the
transmit buffer, and message transmission is performed when the transmission right is acquired.
When the TXPR bit is set, internal arbitration is performed again, and the highest-priority message
is found and stored in the transmit buffer.
When b is selected, if a number of messages are designated as waiting for transmission (TXPR =
1), messages are stored in the transmit buffer in low-to-high mailbox order (priority order:
mailbox 1 > mailbox 15). CAN bus arbitration is then carried out for the messages in the transmit
buffer, and message transmission is performed when the bus is acquired.
Rev. 6.00 Feb 22, 2005 page 648 of 1484
REJ09B0103-0600
Receive-only mailbox (mailbox 0)
No setting is necessary, as this mailbox is always used for reception.