HD64F2638F20J Datasheet, PDF (714/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 16 Controller Area Network (HCAN)
H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
• 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)
Message transmit wait TXPR setting
Set TXCR bit corresponding to message
to be canceled
Cancellation possible?
Yes
Message not sent
Clear TXCR, TXPR
ABACK = 1
IRR8 = 1
No
Completion of message transmission
TXACK = 1
Clear TXCR, TXPR
IRR8 = 1
IMR8 = 1?
Yes
No
Interrupt to CPU
Clear TXACK
Clear ABACK
Clear IRR8
End of transmission/transmission
cancellation
: Settings by user
: Processing by hardware
Figure 16-8 Transmit Message Cancellation Flowchart
Page 664 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010