H8SSLASH2224 datasheet(230/1071 Pages) RENESAS

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Section 5 Interrupt Controller

Rev. 5.00 Aug 08, 2006 page 144 of 982

REJ09B0054-0500

The interrupt source selected is the interrupt with the highest priority level, and whose priority

level set in IPR is higher than the mask level.

Table 5.5

Interrupts Selected in Each Interrupt Control Mode (2)

Interrupt Control Mode

Selected Interrupts

All interrupts

Highest-priority-level (IPR) interrupt whose priority level is greater

than the mask level (IPR > I2 to I0).

Default Priority Determination: When an interrupt is selected by 8-level control, its priority is

determined and a vector number is generated.

If the same value is set for IPR, acceptance of multiple interrupts is enabled, and so only the

interrupt source with the highest priority according to the preset default priorities is selected and

has a vector number generated.

Interrupt sources with a lower priority than the accepted interrupt source are held pending.

Table 5.6 shows operations and control signal functions in each interrupt control mode.

Table 5.6

Operations and Control Signal Functions in Each Interrupt Control Mode

Setting

Interrupt

Acceptance

Control

8-Level Control

Interrupt

Control

Mode

INTM1 INTM0

I2 to I0

IPR

Default Priority

Determination

(Trace)

*



*

Legend:

O: Interrupt operation control performed.

X: No operation (All interrupts enabled).

IM: Used as interrupt mask bit.

PR: Sets priority.

: Not used.

Notes: 1. Set to 1 when interrupt is accepted.

2. Keep the initial setting.

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