NEC 78K0R/KE3 User Manual page 592

Figure 15-7. Interrupt Request Acknowledgment Processing Algorithm
××IF:
Interrupt request flag
××MK:
Interrupt mask flag
××PR0:
Priority specification flag 0
××PR1:
Priority specification flag 1
IE: Flag that controls acknowledgment of maskable interrupt request (1 = Enable, 0 = Disable)
ISP0, ISP1: Flag that indicates the priority level of the interrupt currently being serviced (see Figure 15-6)
Note For the default priority, refer to Table 15-1 Interrupt Source List.
592
CHAPTER 15 INTERRUPT FUNCTIONS
Start
No
××IF = 1?
Yes (interrupt request generation)
No
××MK = 0?
Yes
××PR
(××PR
1, 0)
≥
(ISP1, ISP0)
Higher priority
No
than other interrupt requests
simultaneously
generated?
Yes
Note
Higher default priority
than other interrupt requests
simultaneously
generated?
Yes
No
IE = 1?
Yes
Vectored interrupt servicing
User's Manual U17854EJ9V0UD
Interrupt request held pending
No (Low priority)
Interrupt request held pending
Interrupt request held pending
No
Interrupt request held pending
Interrupt request held pending