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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
Yes
No
Yes
Yes
: Settings by user
: Processing by hardware
No
No
Interrupt settings
Transmit data setting
Arbitration field setting
Control field setting
Data field setting
Message transmission
GSR2 = 0 (during transmission only)
TXACK = 1
IRR8 = 1
Clear TXACK
Clear IRR8
Message transmission wait
TXPR setting
Bus idle?
Transmission completed?
IMR8 = 1?
Interrupt to CPU
End of transmission
Figure 15.9 Transmission Flowchart
Содержание H8S/2627
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