Hitachi F-ZTAT H8/3039 Series Hardware Manual page 114

IRQ
Figure 5-6 Process Up to Interrupt Acceptance when UE = 0
102
Yes
Priority level 1?
Yes
No
0
Yes
No
IRQ
1
Yes
ADI
I = 0
Yes
Yes
Program execution state
Interrupt requested?
Yes
NMI
No
No
IRQ
0
Yes
Yes
No
UI = 0
Save PC and CCR
← ←
I 1, UI 1
Read vector address
Branch to interrupt
service routine
No
No
No
IRQ
1
Yes
ADI
Yes
No
I = 0
Yes
No
Pending