Interrupts
77
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
Hardware Interrupts
Hardware interrupts are classified into two types — special interrupts and peripheral function interrupts.
(1) Special Interrupts
NMI Interrupt
An NMI interrupt is generated when input on the NMI pin changes state from high to low. For details
DBC Interrupt
Do not normally use this interrupt because it is provided exclusively for use by development support
tools.
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".
Oscillation Stop and Re-oscillation Detection Interrupt
Generated by the oscillation stop and re-oscillation detection function. For details about the oscilla-
tion stop detection function, refer to the section "clock generating circuit".
Power Supply Down Detection Interrupt
Generated by the voltage detection circuit. For details about the voltage detection circuit, refer to the
section "voltage detection circuit".
Single-step Interrupt
Do not normally use this interrupt because it is provided exclusively for use by development support
tools.
Address Match Interrupt
An address match interrupt is generated immediately before executing the instruction at the address
indicated by the RMAD0 to RMAD3 register that corresponds to one of the AIER register’s AIER0 or
AIER1 bit or the AIER2 register’s AIER20 or AIER21 bit which is "1" (address match interrupt en-
abled). For details about the address match interrupt, refer to the section "address match interrupt".
(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. For details
about the peripheral functions, refer to the description of each peripheral function in this manual.