Interrupt Operation; Interrupt Control Modes And Interrupt Operation - Renesas H8S/2633 Series Hardware Manual

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Interrupt Operation

Interrupt operations in the H8S/2633 Series 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 IPR, and the masking state indicated

by the I and UI bits in the CPU's CCR, and bits I2 to I0 in EXR.

Interrupt Control Modes

Control Mode INTM1 INTM0 Registers

Priority Setting

Mask Bits Description

Interrupt mask control is

performed by the I bit.

Setting prohibited

8-level interrupt mask control

is performed by bits I2 to I0.

8 priority levels can be set with

Setting prohibited