Renesas R8C/Tiny Series Software Manual page 276
16-bit single-chip microcomputer
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Also See for R8C/Tiny Series:
- User manual (29 pages) ,
- Hardware manual (227 pages) ,
- Software manual (297 pages)
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Chapter 5
Interrupts
Interrupt request
generated
Reset
Time
Interrupt 1
Interrupt priority level = 3
Interrupt 2
Interrupt priority level = 5
Interrupt 3
Interrupt priority level = 2
Figure 5.6.1 Multiple Interrupts
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
Main routine
I = 0
IPL = 0
I = 1
page 258 of 263
Nesting
Interrupt 1
I = 0
IPL = 3
I = 1
Interrupt 2
I = 0
IPL = 5
REIT
REIT
I = 1
IPL = 3
Interrupt 3
REIT
REIT
I = 1
IPL = 0
Main routine instructions
are not executed.
Interrupt 3
I = 0
IPL = 2
REIT
REIT
I = 1
I : Interrupt enable flag
IPL = 0
IPL : Processor interrupt priority level
: Automatically executed.
: Set in software.
5.6 Multiple interrupts
Multiple interrupts
Not acknowledged because
of low interrupt priority
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