Hardware Interrupts - Renesas R8C/Tiny Series Software Manual

Chapter 5 Interrupts

5.1.3 Hardware Interrupts

There are two types in hardware interrupts: special interrupts and peripheral function interrupts.
Special interrupts
Special interrupts are nonmaskable.
(1) Watchdog timer interrupt
This interrupt is caused by the watchdog timer. Initialize the watchdog timer after the watchdog timer
interrupt is generated. For details about the watchdog timer, refer to the R8C's hardware manual.
(2) Oscillation stop detection interrupt
This interrupt is caused by the oscillation stop detection function. For details about the oscillation stop
detection function, refer to the R8C's hardware manual.
(3) Single-step interrupt
This interrupt is used exclusively by development support tools. Do not use this interrupt.
(4) Address-match interrupt
When the AIER0 or AIER1 bit in the AIER register is set to 1 (address-match interrupt enabled), the
address-match interrupt is generated just before executing the instruction of the address indicated by
the corresponding RMAD0 to RMAD1 register.
Peripheral function interrupts
These interrupts are generated by the peripheral functions built into the microcomputer. Peripheral func-
tion interrupts are maskable.
The types of built-in peripheral functions vary with each R8C model, as do the interrupt sources. For
details about peripheral function interrupts, refer to the R8C's hardware manual.
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
page 248 of 263
5.1 Outline of Interrupt