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98
Program execution state
Interrupt requested?
NMI
No
Yes
No
Yes
No
Priority level 1?
No
IRQ
0
Yes
No
IRQ
1
Yes
ADI
Yes
No
IRQ
0
Yes
No
IRQ
1
Yes
ADI
Yes
No
I = 0
Yes
No
I = 0
Yes
UI = 0
Yes
No
Save PC and CCR
I 1, UI 1
←
Pending
Branch to interrupt
service routine
Yes
←
Read vector address
Figure 5-6 Process Up to Interrupt Acceptance when UE = 0