HD6432621 Hitachi, HD6432621 Datasheet - Page 614

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

570
Initialization
Receive data setting
Clear all RXPRn bits of mailbox for which
receive interrupt requests are enabled
Local acceptance filter settings
Mailbox (RAM) initialization
Arbitration field setting
Message control read
Message data read
Message reception
(Match of identifier
Same RXPR = 1?
Interrupt settings
Interrupt to CPU
End of reception
MBCR setting
IRR0 clearing
BCR setting
in mailbox?)
Data frame?
by MBIMR
IMR1 = 1?
IRR1 = 0
IRR1 = 1
RXPR
Yes
No
Yes
No
Figure 15-9 Reception Flowchart
No
Yes
No
Yes
Transmission of data frame corresponding
Clear all RXPRn bits of mailbox for which
receive interrupt requests are enabled
Message control read
IRR2 = 1, IRR1 = 1
IRR2 = 0, IRR1 = 0
Message data read
RXPR, RFPR = 1
Unread message
Interrupt to CPU
to remote frame
by MBIMR
IMR2 = 1?
No
: Settings by user
: Processing by hardware
Yes