S32K3 - Why do I get the wakeup registers always 0 (from standby mode to wakeup)

[Foxconn]

Hello, I have a problem and need help. Can you give me some guidance or answer?

In the main function, I would first check for the reason for the power up.

when I wakeup from standby mode. I hope to get the

MC_RGM (base address: 4028_C000h) , RDSS (offset) register occurs to 1.

But... I always get 0 from FES_RES / DES_RES.  How to get the correct register and value?

[danielmartynek · Accepted solution]

Hello @Foxconn,

If RDSS = 0x0, read MC_ME[PREV_MODE].

BR, Daniel

[Foxconn]

Thanks a lot for your solution. It works fine.
Also, calling a function by power reason can fix it too.