80
Yes
Program execution state
Interrupt
generated?
NMI?
Level 6 interrupt?
Mask level 5
or below?
Level 7 interrupt?
Mask level 6
or below?
Save PC, CCR, and EXR
Clear T bit to 0
Update mask level
Read vector address
Branch to interrupt
service routine
Hold pending
Level 1 interrupt?
Mask level 0?
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
No
No
No
No
No
No
Figure 3.6 Flowchart of Procedure Up to Interrupt Acceptance
in Interrupt Control Mode 2
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