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User’s Manual U11969EJ3V0UM00
113
CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
Figure 5-7. Example of Interrupt Nesting Process (1/2)
Remarks 1. a to u in the figure are the names of interrupt requests shown for the sake of explanation.
2. The default priority in the figure indicates the relative priority between two interrupt requests.
Caution
The data of the EIPC and EIPSW registers must be saved before executing multiple interrupts.
Main routine
EI
EI
Interrupt request a
(level 3)
Processing of a
Processing of b
Interrupt
request b
(level 2)
Processing of c
Interrupt request c
(level 3)
Interrupt request d
(level 2)
Processing of d
Processing of e
EI
Interrupt request e
(level 2)
Interrupt request f
(level 3)
Processing of f
EI
Processing of g
Interrupt request g
(level 1)
Interrupt request h
(level 1)
Processing of h
Interrupt request h is kept pending even if interrupts are
enabled because its priority is the same as that of g.
Interrupt request f is kept pending even if interrupts are
enabled because its priority is lower than that of e.
Interrupt request b is accepted because the priority of
b is higher than that of a and interrupts are enabled.
Although the priority of interrupt request d is higher
than that of c, d is kept pending because interrupts
are disabled.
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