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M30245 Group
Interrupt request
Time
Interrupt priority level = 3
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Interrupt priority level = 5
Interrupt priority level = 2
Figure 2.15.6. Example of the multiple interrupts operation
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
generated
Main routine
Reset
I = 0
IPL = 0
Interrupt 1
I = 1
Interrupt 2
Interrupt 3
page 273 of 354
Nesting
Interrupt 1
I = 0
IPL = 3
I = 1
Interrupt 2
I = 0
IPL = 5
REIT
I = 1
IPL = 3
Interrupt 3
REIT
Not acknowledged because
of low interrupt priority
I = 1
IPL = 0
Main routine instructions
are not executed.
Interrupt 3
I = 0
IPL = 2
REIT
I = 1
I : Interrupt enable flag
IPL = 0
IPL : Processor interrupt priority level
: Automatically executed.
: Be sure to set in software.
2. Multiple Interrupts
Multiple interrupts
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