HD64F7047F50 Datasheet, PDF (508/766 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

15.4.3 Message Transmission by Event Trigger
Messages are transmitted using mailboxes 1 to 31. The transmission procedure after initial settings
is described below, and a transmission flowchart is shown in figure 15.8.
Initialization (after hardware reset only)
HCAN2 port setting
Clear IRR0
BCR setting
MBC setting
Mailbox initialization
Message transmission method setting
Interrupt settings
Transmit data setting
Arbitration field setting
Control field setting
Data field setting
Message transmission wait
TXPR setting
: Settings by user
: Processing by hardware
Bus idle?
No
Yes
Message transmission
GSR2 = 0 (during transmission only)
Transmission completed?
No
Yes
TXACK = 1
IRR8 = 1
IMR8 = 1?
Yes
No
Interrupt to CPU (SLE1)
Clear TXACK
Clear IRR8
End of transmission
Figure 15.8 Transmission Flowchart by Event Trigger
Rev. 2.00, 09/04, page 466 of 720