topic Re: mc9s12 wake up by irq in S12 / MagniV Microcontrollers

mc9s12 wake up by irq

burnyfu — Thu, 27 Jul 2017 15:56:27 GMT

Hi,

I used mc9s12xs128 microcontroller.The microcontroller can enter the stop mode and i want use irq to wake up it.But the irq not work.In normal mode,the irq is ok.

Help me think about the solution to the problem.Thank you!

Re: mc9s12 wake up by irq

danielmartynek — Thu, 27 Jul 2017 19:00:34 GMT

Hi,

Can you be more specific? Which interrupt do you use?

If I understand, the interrupt works, but you cannot wake the MCU, right?

Regards,

Daniel

Re: mc9s12 wake up by irq

burnyfu — Fri, 28 Jul 2017 01:49:09 GMT

Hi,

I used PP0 pins as IRQ interrupt.The enter stop mode code is as follows

asm ANDCC #0x7F; //clear S bit
asm nop;
asm STOP; //STOP mode

My IRQ interrupt function do nothing. It's right?

Re: mc9s12 wake up by irq

danielmartynek — Fri, 28 Jul 2017 11:28:11 GMT

Hi,

IRQ interrupt is associated with the IRQ pin. But you want to use Port P interrupt.

These are two different interrupts.

Regarding the Port P interrupt, you only need to enable the interrupt in PIEP register, select polarity in PPSP register and use correct interrupt vector.

Regards,

Daniel