Hitachi H8S/2646 Hardware Manual page 612

value at this time, an interrupt can be sent to the CPU. Figure 15-10 shows a flowchart of
unread message overwriting.
Unread message overwrite
Interrupt to CPU
Message control/message data read
580
UMSR = 1
IRR9 = 1
IMR9 = 1?
No
Clear IRR9
End
Figure 15-10 Unread Message Overwrite Flowchart
Yes
: Settings by user
: Processing by hardware