Renesas M16C User Manual

Rev.1.10    Jul 01, 2005    page 60 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

9. Interrupt

This document is under development and its contents are subject to change.

• Maskable Interrupt:

An interrupt which can be enabled (disabled) by the interrupt enable flag

(I flag) or whose interrupt priority can be changed by priority level.

• Non-Maskable Interrupt: An interrupt which cannot be enabled (disabled) by  the interrupt enable flag

(I flag) or whose interrupt priority cannot be changed by priority level.

Interrupt



















Software

(Non-maskable interrupt)

Hardware











Special

(Non-maskable interrupt)

Peripheral function 

(1)

(Maskable interrupt)











Undefined instruction (UND instruction)

Overflow (INTO instruction)

BRK instruction

INT instruction















_______

NMI

________

DBC 

(2)

Oscillation stop and re-oscillation detection

Watchdog timer

Single step 

(2)

Address match

NOTES:

1. The peripheral functions in the microcomputer are used to generate the peripheral interrupt.

2. Do not normally use this interrupt because it is provided exclusively for use by development

support tools.

Figure 9.1 shows the types of interrupts.