SH7055S Datasheet, PDF (610/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Unread message overwrite
UMSR = 1
IRR9 = 1
IMR9 = 1?
Yes
No
Interrupt to CPU
Clear IRR9
Message control/message data read
End
: Settings by user
: Processing by hardware
Figure 16.12 Unread Message Overwrite Flowchart
Rev.2.0, 07/03, page 572 of 960