h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 604

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Controller Area Network (HCAN)
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.
15.3.3
Message transmission is performed using mailboxes 1 to 15. The transmission procedure is
described below, and a transmission flowchart is shown in figure 15.7.
Initialization (after hardware reset only)
Interrupt and transmit data settings
Message transmission and interrupts
Rev. 5.00 Sep 22, 2005 page 578 of 1136
REJ09B0257-0500
a. IRR0 bit in the intereupt register (IRR0) clearing
b. Bit rate settings
c. Mailbox transmit/receive settings
d. Mailbox initialization
e. Message transmission method setting
a. CPU interrupt source setting
b. Arbitration field setting
c. Control field setting
d. Data field setting
a. Message transmission wait
b. Message transmission completion and interrupt
c. Message transmission abort
d. Message retransmission
Transmit Mode