H8SSLASH2214 datasheet(166/936 Pages) RENESAS

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Section 5 Interrupt Controller

Rev.4.00 Sep. 18, 2008 Page 106 of 872

REJ09B0189-0400

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 5.7

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).

(3) 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 5.8 shows operations and control signal functions in each interrupt control mode.

Table 5.8

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:

: Interrupt operation control performed

: 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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