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Section 20 Controller Area Network
Page 1072 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
During merged arbitrating window, event-trigger transmission is served after completion of time-
triggered transmission. For example, If transmission of Mailbox-25 is completed and CYCTR
doesn't reach TTT26, event-trigger transmission starts based on message transmission priority
specified by MCR2. TXPR of time-triggered transmission is not cleared after transmission
completion, however, that of event-triggered transmission is cleared.
Note: that in the case that the TXPR is not set for the Mailbox which is assigned to close the
Merged Arbitrating Window (MAW), then the MAW will still be closed (at the end of the
TEW following the TTT of the assigned Mailbox.
Please refer to Table Roles of Mailboxes in section 20.3.2, Mailbox Structure.