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M16C/29 Group
9. Interrupts
9.1 Type of Interrupts
Figure 9.1.1 shows types of interrupts.
Software
(Non-maskable interrupt)
Interrupt
Hardware
Note 1: Peripheral function interrupts are generated by the microcomputer's internal functions.
Note 2: Do not normally use this interrupt because it is provided exclusively for use by development
support tools.
Figure 9.1.1. Interrupts
• Maskable Interrupt: An interrupt which can be enabled (disabled) by the interrupt enable flag (I flag) or
• Non-maskable Interrupt: An interrupt which cannot be enabled (disabled) by the interrupt enable flag
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
Special
(Non-maskable interrupt)
Peripheral function (Note 1)
(Maskable interrupt)
whose interrupt priority can be changed by priority level.
(I flag) or whose interrupt priority cannot be changed by priority level.
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Undefined instruction (UND instruction)
Overflow (INTO instruction)
BRK instruction
INT instruction
_______
NMI
________
DBC (Note 2)
Watchdog timer
Oscillation stop and re-oscillation
detection
Voltage down detection
Single step (Note 2)
Address match
9. Interrupts
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