Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario descargar pdf (Pagina 268)

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Chapter 5 Interrupt

5.1.3 Hardware Interrupts

There are Two types in hardware Interrupts; special interrupts and Peripherai I/O interrupts.

(1) Special interrupts

Special interrupts are nonmaskable interrupts.

• Reset

____________

A reset occurs when the RESET pin is pulled low.

______

• NMI interrupt

______

This interrupt occurs when the NMI pin is pulled low.

________

• DBC interrupt

This interrupt is used exclusively for debugger purposes. You normally do not need to use this interrupt.

• Watchdog timer interrupt

This interrupt is caused by the watchdog timer.

• Single-step interrupt

This interrupt is used exclusively for debugger purposes. You normally do not need to use this inter-

rupt. A single-step interrupt occurs when the D flag is set (= 1); in this case, an interrupt is generated

each time an instruction is executed.

• Address-match interrupt

This interrupt occurs when the program's execution address matches the content of the address match

This interrupt does not occur if any address other than the start address of an instruction is set in the

address match register.

(2) Peripheral I/O interrupts

These interrupts are generated by the peripheral functions built into the microcomputer system. The

types of built-in peripheral functions vary with each M16C model, so do the types of interrupt causes. The

interrupt vector table uses the same software interrupt numbers 0–31 that are used by the INT instruction.

Peripheral I/O interrupts are maskable interrupts. For details about peripheral I/O interrupts, refer to the

M16C User’s Manual.

5.1 Outline of Interrupt

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Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario Pagina 268