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RL78/G1A CHAPTER 16 INTERRUPT FUNCTIONS
Figure 16-7. Interrupt Request Acknowledgment Processing Algorithm
No
No
Yes
Jul 04, 2013
No
Yes
Yes (Hi priority)
No
Yes
Yes
No
IE = 1?
Vectored interrupt servicing
Start
××IF = 1?
××MK = 0?
(××PR
1,
××PR
0)
(ISP1, ISP0)
Yes (interrupt request generation)
No (Low priority)
Interrupt request held pending
Interrupt request held pending
Interrupt request held pending
Interrupt request held pending
Interrupt request held pending
Higher priority
than other interrupt requests
simultaneously
generated?
Higher default priority
Note
than other same-priority interrupt
requests generated
simultaneously?
≥
××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 16-6)
Note For the default priority, see Table 16-1 Interrupt Source List.
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