h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 714

• 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)
Rev. 6.00 Feb 22, 2005 page 654 of 1484
REJ09B0103-0600
Message retransmission
If transmission of a transmit message is aborted in the following cases, the message is
retransmitted automatically:
a. CAN bus arbitration failure (failure to acquire the bus)
b. Error during transmission (bit error, stuff error, CRC error, frame error, ACK error)
Set TXCR bit corresponding to message
Message transmit wait TXPR setting
End of transmission/transmission
Cancellation possible?
Clear TXCR, TXPR
Message not sent
Interrupt to CPU
to be canceled
Clear ABACK
Clear TXACK
Figure 16-8 Transmit Message Cancellation Flowchart
ABACK = 1
Clear IRR8
cancellation
IMR8 = 1?
IRR8 = 1
No
Yes
No
Yes
Completion of message transmission
Clear TXCR, TXPR
TXACK = 1
IRR8 = 1
: Settings by user
: Processing by hardware