Message Transmission; Figure 15.9 Transmission Flowchart - Renesas H8S Series Hardware Manual

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)
Message transmission method setting
GSR2 = 0 (during transmission only)
Clear IRR0
BCR setting
MBCR setting
Mailbox initialization
Interrupt settings
Transmit data setting
Arbitration field setting
Control field setting
Data field setting
Message transmission wait
TXPR setting
Bus idle?
Yes
Message transmission
Transmission completed?
Yes
TXACK = 1
IRR8 = 1
IMR8 = 1?
No
Interrupt to CPU
Clear TXACK
Clear IRR8
End of transmission

Figure 15.9 Transmission Flowchart

Section 15 Controller Area Network (HCAN)
: Settings by user
: Processing by hardware
No
No
Yes
Rev. 6.00 Mar 15, 2006 page 421 of 570
REJ09B0211-0600