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Priority level 1?
IRQ
0
Yes
Figure 5-4 Process Up to Interrupt Acceptance when UE = 1
Program execution state
Interrupt requested?
Yes
NMI
No
Yes
No
No
IRQ
1
Yes
ADI
Yes
I = 0
Save PC and CCR
←
I
Read vector address
Branch to interrupt
service routine
101
No
Yes
No
No
IRQ
0
Yes
IRQ
1
Yes
No
Yes
1
Pending
No
ADI
Yes
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