Hitachi H8/3008 Hardware Manual page 109

Yes
Priority level 1?
Yes
No
IRQ
0
Yes
IRQ
1
Yes
I = 0
Yes
Yes
Figure 5.6 Process Up to Interrupt Acceptance when UE = 0
Program execution state
Interrupt requested?
Yes
NMI
No
No
IRQ
Yes
No
TEI1
Yes
No
UI = 0
Save PC and CCR
← ←
I 1, UI 1
Read vector address
Branch to interrupt
service routine
No
No
0
No
IRQ
1
Yes
TEI1
I = 0
Yes
No
Pending
Yes
No
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