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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
463
Figure 18-12. Interrupt Request Acknowledge Processing Algorithm
××
IF : Interrupt request flag
××
MK : Interrupt mask flag
××
PR : Priority specify flag
IE
: Flag to control maskable interrupt request acknowledge (1 = Enable, 0 = Disable)
ISP
: Flag to indicate the priority of interrupt being serviced (0 = Interrupt with high-priority is being
serviced, 1 = Interrupt request is not acknowledged or an Interrupt with low-priority is being
serviced)
Start
××
IF = 1?
××
MK = 0?
××
PR = 0?
Any simul-
taneously generated
××
PR = 0 interrupt
requests?
Any simul-
taneously generated
high-priority interrupt
requests?
IE = 1?
ISP = 1?
Interrupt request
reserve
Interrupt request
reserve
Interrupt request
reserve
Any high-
priority interrupt
among simultaneously
generated
××
PR = 0
interrupt requests?
IE = 1?
Vectored interrupt
servicing
Yes
No
No
Yes
No
No
Yes (High Priority)
Yes (Interrupt Request Generation)
Yes
No (Low Priority)
Yes
No
No
Yes
Yes
No
No
Yes
Interrupt request
reserve
Interrupt request
reserve
Interrupt request
reserve
Interrupt request
reserve
Vectored interrupt
servicing
Summary of Contents for 78014Y Series
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