M30245_06 RENESAS [Renesas Technology Corp], M30245_06 Datasheet - Page 282

• Manufacturer Part Number: M30245_06
• Description: RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

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