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Initialization (after hardware reset only)
IRR0 clearing
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
No
No
Yes
Figure 15-7 Transmission Flowchart
: Settings by user
: Processing by hardware
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