UPD78F1502AGK-GAK-AX Datasheet, PDF (781/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 19 INTERRUPT FUNCTIONS
Figure 19-14. Interrupt Request Acknowledgment Processing Algorithm
Start
No
××IF = 1?
Yes (interrupt request generation)
××MK = 0?
No
Yes
Interrupt request held pending
(××PR1, ××PR0)
≤ (ISP1, ISP0)
No (Low priority)
Interrupt request held pending
Higher priority
than other interrupt requests
simultaneously
generated?
Yes
No
Interrupt request held pending
Higher default priority^Note
than other interrupt requests
simultaneously
generated?
Yes
No
Interrupt request held pending
No
IE = 1?
Yes
Interrupt request held pending
Vectored interrupt servicing
××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 19-8)
Note For the default priority, refer to Table 19-1 Interrupt Source List.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011