Message Transmission; Figure 13.9 Transmission Flowchart - Renesas H8SX/1520 Series Hardware Manual

Section 13 Controller Area Network (HCAN)
13.4.3

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 13.9.
Rev. 3.00 Mar. 14, 2006 Page 490 of 804
REJ09B0104-0300
Downloaded from Elcodis.com electronic components distributor
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
Bus idle?
Yes
Message transmission
GSR2 = 0 (during transmission only)
Transmission completed?
Yes
TXACK = 1
IRR8 = 1
IMR8 = 1?
No
Interrupt to CPU
Clear TXACK
Clear IRR8
End of transmission

Figure 13.9 Transmission Flowchart

: Settings by user
: Processing by hardware
No
No
Yes