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M16C/29 Group
9.1.2 Hardware Interrupts
Hardware interrupts are classified into two types — special interrupts and peripheral function inter-
rupts.
9.1.2.1 Special Interrupts
Special interrupts are non-maskable interrupts.
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9.1.2.1.1 NMI Interrupt
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An NMI interrupt is generated when input on the NMI pin changes state from high to low. For details
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about the NMI interrupt, refer to the section "NMI interrupt".
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9.1.2.1.2 DBC Interrupt
This interrupt is exclusively for debugger, do not use in any other circumstances.
9.1.2.1.3 Watchdog Timer Interrupt
Generated by the watchdog timer. Once a watchdog timer interrupt is generated, be sure to initialize
the watchdog timer. For details about the watchdog timer, refer to the section "watchdog timer".
9.1.2.1.4 Oscillation Stop and Re-oscillation Detection Interrupt
Generated by the oscillation stop and re-oscillation detection function. For details about the oscilla-
tion stop and re-oscillation detection function, refer to the section "clock generating circuit".
9.1.2.1.5 Voltage Down Detection Interrupt
Generated by the voltage detection circuit. For details about the voltage detection circuit, refer to the
section "voltage detection circuit".
9.1.2.1.6 Single-step Interrupt
Do not normally use this interrupt because it is provided exclusively for use by development support
tools.
9.1.2.1.7 Address Match Interrupt
An address match interrupt is generated immediately before executing the instruction at the address
indicated by the RMAD0 or RMAD1 register, if the corresponding enable bit (AIER register's AIER0
or AIER1bit) is set to "1". For details about the address match interrupt, refer to the section "address
match interrupt".
9.1.2.2 Peripheral Function Interrupts
Peripheral function interrupts are maskable interrupts and generated by the microcomputer's internal
functions. The interrupt sources for peripheral function interrupts are listed in "Table 1.11.2.
Relocatable Vector Tables". For details about the peripheral functions, refer to the description of each
peripheral function in this manual.
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
page 63 of 402
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9. Interrupts
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