Interrupt Controller; Interrupt Controller Features - Hitachi H8S/2678 Series Reference Manual

3.2

Interrupt Controller

3.2.1

Interrupt Controller Features

• Two interrupt control modes
 Either of two interrupt control modes can be set by means of the INTM1 and INTM0 bits in
the interrupt control register (INTCR).
• Priorities settable with IPRs
 Interrupt priority registers (IPRs) are 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.
• Seventeen external interrupt pins
 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
independently for IRQ15 to IRQ0.
• DTC and DMAC control
 DTC and DMAC activation is controlled by means of interrupts.
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