H8S2245 datasheet(158/818 Pages) RENESAS

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Section 5 Interrupt Controller

Rev.3.00 Mar. 26, 2007 Page 116 of 772

REJ09B0355-0300

5.4

Interrupt Operation

5.4.1

Interrupt Control Modes and Interrupt Operation

Interrupt operations in the H8S/2245 Group differ depending on the interrupt control mode.

NMI interrupts are accepted at all times except in the reset state and the hardware standby state. In

the case of IRQ interrupts and on-chip supporting module interrupts, an enable bit is provided for

each interrupt. Clearing an enable bit to 0 disables the corresponding interrupt request. Interrupt

sources for which the enable bits are set to 1 are controlled by the interrupt controller.

Table 5.5 shows the interrupt control modes.

The interrupt controller performs interrupt control according to the interrupt control mode set by

the INTM1 and INTM0 bits in SYSCR, the priorities set in ICR, and the masking state indicated

by the I and UI bits in the CPU's CCR.

Table 5.5

Interrupt Control Modes

SYSCR

Interrupt

Control Mode INTM1 INTM0

Priority

Setting Registers

Interrupt

Mask Bits Description

ICR

Interrupt mask control is

performed by the I bit.

Priority can be set with ICR.

ICR

I, UI

3-level interrupt mask control

is performed by the I and UI

bits.

Priority can be set with ICR.

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