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CHAPTER 16 INTERRUPT AND TEST FUNCTIONS
User’s Manual U11302EJ4V0UM
Figure 16-12. Interrupt Request Acknowledge Processing Algorithm
××
IF:
Interrupt request flag
××
MK: Interrupt mask flag
××
PR: Priority specification flag
IE:
Flag controlling acknowledgment of maskable interrupt request (1 = Enabled, 0 = Disabled)
ISP:
Flag indicating priority of interrupt currently serviced (0 = Interrupt with high priority is serviced,
1 = No interrupt request is acknowledged, or interrupt with low priority is serviced)
Start
××
IF = 1?
××
MK = 0?
××
PR = 0?
Any
simultaneously
generated
××
PR = 0
interrupt
requests?
Any
simultaneously
generated high-priority
interrupt
requests?
IE = 1?
ISP = 1?
Vectored interrupt
servicing
Interrupt request
held pending
Interrupt request
held pending
Interrupt request
held pending
Interrupt request
held pending
Interrupt request
held pending
Interrupt request
held pending
Interrupt request
held pending
Vectored interrupt
servicing
Any high-
priority interrupt request
among simultaneously generated
××
PR = 0 interrupt
requests?
IE = 1?
Yes (high priority)
Yes
No
Yes
No
No
No
Yes (interrupt request
generation)
No
Yes
No (low priority)
Yes
Yes
No
Yes
Yes
No
No
Содержание mPD780208 Subseries
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