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CHAPTER 22 INTERRUPT FUNCTIONS
User’s Manual U12697EJ3V0UM
Figure 22-11. Interrupt Acknowledgment Processing Algorithm
No
××
IF = 1
××
MK = 0
××
ISM = 1
××
CSE = 1
IE = 1
Higher priority
than interrupt currently
being serviced?
Higher priority
than other existing interrupt
requests?
Highest default
priority among interrupt
requests of same
priority?
Vectored interrupt
generation
Interrupt request?
Yes
No
Interrupt mask released?
Yes
No
Yes
Yes
Yes
Yes
No
No
Interrupt enabled state?
Macro service?
No
No
No
Interrupt request
held pending
Yes
Context switching?
Context switching
generation
Yes
Highest
default priority among
macro service
requests?
Macro service
processing execution
Interrupt request
held pending
No
Yes
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