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5.1
Overview
5.1.1
Features
The H8S/2633 Series controls interrupts by means of an interrupt controller. The interrupt
controller has the following features:
• Two interrupt control modes
Any 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 IPR
An interrupt priority register (IPR) is provided for setting interrupt priorities. Eight priority
levels can be set for each module for all interrupts except NMI.
NMI is assigned the highest priority level of 8, and can be accepted at all times.
• 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.
• Nine external interrupts
NMI is the highest-priority interrupt, and is accepted at all times. Rising edge or falling
edge can be selected for NMI.
Falling edge, rising edge, or both edge detection, or level sensing, can be selected for IRQ7
to IRQ0.
• DTC and DMAC control
DTC and DMAC activation is performed by means of interrupts.
Section 5 Interrupt Controller
91
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