Rev. 1.0, 02/00, page 97 of 1141
Section 6 Interrupt Controller
6.1
Overview
6.1.1
Features
This LSI controls interrupts by means of an interrupt controller. The interrupt controller has the
following features:
•
Two Interrupt Control Modes
Either of two interrupt control modes can be set by means of the INTM1 and INTM0 bits
in the system control register (SYSCR).
•
Priorities Settable with ICR
An interrupt control register (ICR) is provided for setting interrupt priorities. Three
priority levels can be set for each module for all interrupts except NMI.
•
Independent Vector Addresses
All interrupt sources are assigned independent vector addresses, making it unnecessary for
the source to be identified in the interrupt handling routine.
•
Six External Interrupt Pins
NMI is the highest-priority interrupt, and is accepted at all times.
Falling edge, rising edge, or both edge detection can be selected for interrupt IRQ0.
Falling edge or rising edge can be individually selected for interrupts IRQ5 to IRQ1.
Note: * In this LSI, the watch dog timer generates NMIs.