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M16C/64C Group
14.5
Hardware Interrupts
Hardware interrupts are classified into two types: special interrupts and peripheral function interrupts.
14.5.1
Special Interrupts
Special interrupts are non-maskable interrupts.
NMI Interrupt
14.5.1.1
An NMI interrupt is generated when input on the NMI pin changes state from high to low. For details
on the NMI interrupt, refer to 14.9 " NMI Interrupt".
DBC Interrupt
14.5.1.2
Do not use this interrupt because it is provided exclusively for use by development tools.
14.5.1.3
Watchdog Timer Interrupt
This interrupt is generated by the watchdog timer. Once a watchdog timer interrupt is generated, be
sure to refresh the watchdog timer. For details on the watchdog timer, refer to 15. "Watchdog Timer".
14.5.1.4
Oscillator Stop/Restart Detect Interrupt
The interrupt is generated by the oscillator stop/restart detect function. For details on this function,
refer to 8. "Clock Generator".
14.5.1.5
Voltage Monitor 1, Voltage Monitor 2 Interrupt
The interrupt is generated by the voltage detector. For details on the voltage detector, refer to 7.
"Voltage Detector".
14.5.1.6
Single-Step Interrupt
Do not use this interrupt because it is provided exclusively for use by development tools.
14.5.1.7
Address Match Interrupt
When the AIER0 or AIER1 bit in the AIER register, or the AIER20 or AIER21 bit in the AIER2 register
is 1 (address match interrupt enabled), an address match interrupt is generated immediately before
executing an instruction at the address indicated by the corresponding registers RMAD0 to RMAD3.
For details on the address match interrupt, refer to 14.11 "Address Match Interrupt".
14.5.2
Peripheral Function Interrupts
A peripheral function interrupt occurs when a request from a peripheral function in the MCU is
acknowledged. Peripheral function interrupts are maskable interrupts. See Table 14.6 and Table 14.7
"Relocatable Vector Tables". Refer to the descriptions of each function for details on how the
corresponding peripheral function interrupt is generated.
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
14. Interrupts
Page 206 of 807
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