topic Re: IRQ in KEA-128? in Kinetis Microcontrollers

IRQ in KEA-128?

vigneshbalaji — Sat, 18 Feb 2017 05:59:36 GMT

Hi,

what is the advantage of IRQ over KBI other than Interrupt priority?

Re: IRQ in KEA-128?

mjbcswitzerland — Sat, 18 Feb 2017 07:46:56 GMT

There is only one IRQ line (which can be set to one of several possible pins)

There are more KBI lines that can be set together: Beware however that only one KBI interrupt can be recognised at one time so it is not a true multiple-input interrupt.

Regards

Mark

Re: IRQ in KEA-128?

vigneshbalaji — Sat, 18 Feb 2017 08:28:24 GMT

Hi Mark,

Thanks for the number of pins :smileyhappy:. Is there any other advantage of IRQ over KBI?

Is it right that both of them (IRQ and KBI) support asynchronous wakeup of mcu in Stop mode?

Is there any advantage of using IRQ over KBI in any of the other modes of mcu like low power mode?

Re: IRQ in KEA-128?

mjbcswitzerland — Sun, 19 Feb 2017 22:55:38 GMT

Re: IRQ in KEA-128?

vignesh_vb_7 — Mon, 20 Feb 2017 03:45:35 GMT

Hi Mark,

Now I understand that both KBI and IRQ can be used to wakeup microcontroller from stop mode. Is this table provided in user manual, if so can you give me the table no or index for it?

Can you list down all the differences between KBI and IRQ ?

Re: IRQ in KEA-128?

mjbcswitzerland — Mon, 20 Feb 2017 03:49:36 GMT

Yes it is in the user's manual - if you search for the words in the table you will find it,

Please read the two relevant sections in the user manual to get all information.

Regards

Mark

Re: IRQ in KEA-128?

kerryzhou — Mon, 20 Feb 2017 06:08:25 GMT

Hi VIGNESH balaji,

Just as Mark have suggest, if you want to know the difference between the IRQ and the KBI, you need to know each module function, IRQ is easy to understand, it is normal.

So, you need to understanding what is KBI, from this block diagram, it will help you to understand it:

If you have sevel KBI port, and enable all the KBI, then if one of the KBI happens, and it is assert and trigger the interrupt, then the other KBI will have no influence or interrupt. otherwise all the KBI is disassert.

More details, please read our KEA128 KBI chapter carefully.

If after reading the manual, you still have question, please let us know.

Have a great day,
Kerry

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