CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
User’s Manual U13850EJ6V0UD
161
Figure 5-7. Example of Servicing Interrupt Requests Generated Simultaneously
Main routine
EI
Interrupt request a (level 2)
Interrupt request b (level 1)
Note 1
Interrupt request c (level 1)
Note 2
Servicing of interrupt request b
•
•
Servicing of interrupt request c
Servicing of interrupt request a
Interrupt request b and c are
acknowledged first according to their
priorities.
Because the priorities of b and c are
the same, b is acknowledged first
because it has the higher default
priority.
NMI
request
Notes 1.
Higher default priority
2.
Lower default priority
Remarks 1.
a, b, and c in the above figure are the names of interrupt requests shown for the sake of explanation.
2.
The default priority in the above figure indicates the relative priority between two interrupt requests.
Содержание V850/SB1
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