Servicing Example For Simultaneously Issued Interrupt Requests - Renesas NU85E Preliminary User's Manual

Figure 8-7. Servicing Example for Simultaneously Issued Interrupt Requests
Main routine
Interrupt request <a> (level 2),
Interrupt request <b> (level 1),
Interrupt request <c> (level 1) →
Default priority:
a > b > c
Remark <a> to <c> in the figure represent dummy names that are assigned to distinguish between the
interrupt requests.
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Servicing of <b>
EI
Servicing of <c>
Servicing of <a>
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Interrupt requests <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.