Section 5 Interrupt Controller; Overview; Features - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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The H8S/2357 Group controls interrupts by means of an interrupt controller. The interrupt controller has the following

• 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

• 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

 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

Rev.6.00 Oct.28.2004 page 81 of 1016

REJ09B0138-0600H