SH7059 Datasheet, PDF (567/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

17. Controller Area Network-II (HCAN-II)
17.7.4 Message Transmission Cancellation Sequence
Figure 17.10 shows the sequence for canceling a message transmit request set by TXPR.
TXPR transmission
cancellation sequence
Set TXCR[N]*¹
: Processing by hardware
: Setting by user
Read TXPR (1)*¹
Read TXCR (2)*¹
Write value of (2)
and (NOT (value of (1))
to TXPR*¹
Yes
Transmission of MB[N]
in progress?
No
Set ABACK[N]
Transmission of
MB[N] completed
Set ABACK[N]*²
End of TXPR transmission
cancellation sequence
End of TXPR transmission
cancellation sequence
Notes: 1. This setting must be made when transmission is canceled
regardless of whether the mailbox is transmitting the message
or no message is being transmitted.
2. For a message being transmitted, canceling operation of this
transmission near EOF may also set ABACK in some case, though
TXACK is normally set. (Flag invalid)
In this case, clear ABACK.
Figure 17.10 Transmission Cancellation Sequence
Rev.3.00 Mar. 12, 2008 Page 477 of 948
REJ09B0177-0300