HD6417750RF240V Datasheet, PDF (454/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 15 Controller Area Network (HCAN)
15.4.3 Message Transmission
Messages are transmitted using mailboxes 1 to 15. The transmission procedure after initial settings
is described below, and a transmission flowchart is shown in figure 15.9.
Initialization (after hardware reset only)
Clear IRR0
BCR setting
MBCR 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
Clear TXACK
Clear IRR8
End of transmission
Figure 15.9 Transmission Flowchart
Rev. 7.00 Sep. 11, 2009 Page 418 of 566
REJ09B0211-0700