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9. Interrupts
Note
The SI/O4 interrupt of peripheral function interrupts is not available in the 64-pin package.
The low voltage detection function is not available in M16C/29 T-ver. and V-ver..
9.1 Type of Interrupts
Figure 9.1 shows types of interrupts.
Software
(Non-maskable interrupt)
Interrupt
Hardware
NOTES:
1. Peripheral function interrupts are generated by the MCU's internal functions.
2. Do not normally use this interrupt because it is provided exclusively for use by development
tools.
Figure 9.1 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
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Special
(Non-maskable interrupt)
Peripheral function
(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
(2)
Watchdog timer
Oscillation stop and re-oscillation
detection
Low voltage detection
Single step
(2)
Address match
(1)
9. Interrupts
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