R8CSLASH15 datasheet(249/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

20. Precautions

Rev.2.10

Jan 19, 2006

Page 237 of 253

REJ09B0164-0210

20.2.5

Changing Interrupt Factor

The IR bit in the interrupt control register may be set to “1” (interrupt requested) when the interrupt

factor changes. When using an interrupt, set the IR bit to “0” (no interrupt requested) after changing

the interrupt factor.

In addition, the changes of interrupt factors include all factors that change the interrupt factors

assigned to individual software interrupt numbers, polarities, and timing. Therefore, when a mode

change of the peripheral functions involves interrupt factors, edge polarities, and timing, Set the IR bit

to “0” (no interrupt requested) after the change. Refer to each peripheral function for the interrupts

caused by the peripheral functions.

Figure 20.1 shows an Example of Procedure for Changing Interrupt Factor.

Figure 20.1

Example of Procedure for Changing Interrupt Factor

NOTES :

1. Execute the above setting individually. Do not execute

2 or more settings at once (by one instruction).

2. Use the I flag for the INTi (i=0 to 3) interupt.

To prevent interrupt requests from being generated when

using peripheral function interupts other than the INTi

interrupt, disable the peripheral function before changing

the interrupt factor. In this case, use the I flag when all

maskable interrupts can be disabled. When all maskable

interrupts cannot be disabled, use the ILVL0 to ILVL2 bits of

interrupt whose factor is changed.

3. Refer to the 21.2.6 Changing Interrupt Control Register

for the instructions to be used and their usage notes.

Interrupt Factor Change

Disable Interrupt(2, 3)

Set the IR bit to "0" (interrupt not requested) using

the MOV instruction(3)

Change Interrupt Factor (including mode

of peripheral functions)

Enable Interrupt(2, 3)

Change Completed

IR Bit: The interrupt control register bit of an

interrupt whose factor is changed.

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