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IRQ
Figure 5.4 Process Up to Interrupt Acceptance when UE = 1
90
Yes
Priority level 1?
Yes
No
0
Yes
No
IRQ
1
Yes
TEI1
Program execution state
Interrupt requested?
Yes
NMI
No
No
IRQ
0
Yes
Yes
I = 0
Yes
Save PC and CCR
←
I
1
Read vector address
Branch to interrupt
service routine
No
Pending
No
No
IRQ
1
Yes
TEI1
Yes
No
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