SH7059 Datasheet, PDF (577/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

17. Controller Area Network-II (HCAN-II)
17.8.3 Failure on Transmit Cancellation at Mailbox 31
When mailbox 31 is used as a transmit buffer and the transmit cancellation setting is made by TXCR, the following
failures may occur. Note that these failures do not occur in the bus-off state.
• When the transmit cancellation setting is made by TXCR for mailbox 31 during message transmission (except for
mailbox 31), a message may be transmitted and the transmit acknowledge register (TXACK) may be set regardless of
the fact that the abort acknowledge register (ABACK) is set.
• When the transmit cancellation setting is made by TXCR for mailbox 31 during message transmission of mailbox 31,
TXPR may not be cleared even if transmission is completed at mailbox 31 and retransmission may be performed
according to the internal arbitration sequence.
17.8.4 TXPR Setting during Transmission
When the HCAN-II is used with the baud rate set to 1 Mbps, over the period from the TXPR setting during transmission to
the completion of transmission, there are following limitations on the number of transmit mailboxes (MB) and the number
of accesses to mailboxes. Note that there is no limitation when 500 kbps of baud rate is used.
[Important] Limitations on transmission settings during transmission
Rev.3.00 Mar. 12, 2008 Page 487 of 948
REJ09B0177-0300