Question about Interrupt on MPC8xx

Dr. Craig Hollabaugh craig at
Thu Nov 8 04:53:44 EST 2001

At 03:03 PM 11/7/2001 +0900, kingseft at wrote:

> Hi,
> I have a question about interrupt on MPC8xx.
> I conneted Dip switch to IRQ1 on MPC860. When I push down the button, Interrupt occurred and interrupt service routine worked.
> But, I didn't understand that I set falling edge interrupt detection via SIEL on MPC8xx.
> when I push up Dip switch, my interrupt routein also worked.
> Why this happend in spite of setting falling edge??

debounce the switch.

> Could anyone help me with this problem? Any comments will help me.
> Thanks.

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