NMI Wakeup through ICU Module

[surya_phaniteja]

Hi,

I am using S32K146. I have configured PTD3 as NMI and corresponding ISR for NMI as Falling Edge Interrupt in the ICU Module. I am working on Battery Management System (12v). 

My test procedure is "When the ECU goes to sleep, I need to increase one of the cell voltage from 3.3v to 4.5v and interrupt will occur on NMI Pin".

During the testing, when the ECU goes to sleep for the first time. I am increasing one of the cell voltage to 4.5v and wakeup is happening immediately. When the ECU goes to sleep for the second time, again i am increasing the cell voltage to 4.5v, but wakeup is not happening for the second time immediately. It is taking 2-3 minutes for Wakeup

During the debugging, i found that the NMI Pin is connected to many sources  and the second time Wakeup is occuring with other source. 

So, Can anyone help me  how to achieve the same behaviour for the NMI (immediate wakeup) as how it happens for the First time wakeup?

[danielmartynek]

Hi,
There is too little information, i'm afraid.
NMI_b is low-active, the exception is active when the pin is low.
But you can configure PTD3 for an interrupt on a falling edge.
Could you please share the code?
Do you reconfigure the port after the first wake-up?
Do you scope the NMI_b pin? What is the voltage on the pin?

Thanks,
BR, Daniel