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Chapter 5 Interrupt
I = 0
IPL = 0
I = 1
I = 0
IPL = 3
I = 1
I = 0
IPL = 5
REIT
I = 1
IPL = 3
REIT
I = 1
IPL = 0
I = 0
IPL = 2
REIT
I = 1
IPL = 0
Interrupt priority level = 3
Interrupt priority level = 5
Interrupt 3
Interrupt priority level = 2
Not acknowledged because
of low interrupt priority
Main routine instructions
are not executed.
Interrupt request
generated
Nesting
Main routine
Reset
Time
Interrupt 1
Interrupt 1
Interrupt 2
Figure 5.6.1. Multiple interrupts
: Automatically executed.
: Be sure to set in software.
I : Interrupt enable flag
IPL : Processor interrupt priority level
REIT
Interrupt 3
Interrupt 3
REIT
Interrupt 2
Multiple interrupts
5.6 Multiple interrupts
REIT
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