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15.4.4 Message
Reception
The reception procedure after initial settings is described below. A reception flowchart is shown in
Figure 15.11.
RXPR
IRR1 = 1
No
IMR2 = 1?
Interrupt to CPU
Yes
No
Yes
Yes
Yes
No
: Settings by user
: Processing by hardware
No
Yes
Initialization
Clear IRR0
BCR setting
MBCR setting
Mailbox (RAM) initialization
Receive data setting
Arbitration field setting
Local acceptance filter settings
Interrupt settings
Message reception
(Match of identifier
in mailbox?)
Same RXPR = 1?
IMR1 = 1?
Data frame?
Interrupt to CPU
Clear IRR1
End of reception
Clear IRR2, IRR1
Unread message
No
RXPR, RFPR = 1
IRR2 = 1, IRR1 = 1
Message control read
Message data read
Message control read
Message data read
Transmission of data frame corresponding
to remote frame
Figure 15.11 Reception Flowchart
Summary of Contents for H8S/2627
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