S32K312-Wakeup occurred during the process of entering StandBy

[Simon-Liu]

Hi

There is a question about the entry and exit of StandBy, please give me an answer.

If a Wakeup event occurs during the process of entering StandBy, how will the S32K312 behave?

WakeUp after entering the StandBy state? Or do SoftReset? Or does it enter StandBy and does not perform Wakeup?

BestRegards

[VaneB · Accepted solution]

Hi @Simon-Liu 

The software Standby mode entry sequence consists of four steps:

1. SW1: Module shutdown process
2. SW2: Application core shutdown process
3. SW3: Flash memory low-power handshake
4. SW4: Main core shutdown process

In the second step, the application cores(s) execute a WFI.

If a wake-up event occurs right before the application core executes WFI, the wake-up Unit Interrupt will be kept triggered until the wake-up event is cleared.

If the wake-up event interrupt is disabled and is not cleared before triggering WFI, the system will immediately wake up after it gets into standby mode.

If the wake-up event occurs while the application core executes WFI, the device will wake up immediately after it gets into standby mode.

B.R.

VaneB

[Anurag_Raghavan]

What is the meaning of StandBy entry & StandBy exit.... ??

[Simon-Liu]

Hi @VaneB 

Thank you for your answer, I have one more question, please answer:
S32K312 has only one core, so in the process of S32K312 entering StandBy, is there also a step for SW2 to close the App core?

BestRegards

[VaneB]

Hi @Simon-Liu 

Please refer to section 41.5.1 (Software Standby mode entry sequence) of the S32K3xx Reference Manual, Rev. 6.

In this section are described all the steps to enter Standby mode.