Where does the program start running after S32K344 wakes up from standby?

[SCoder41]

Where does the program start running after S32K344 wakes up from standby?

[Robin_Shen · Accepted solution]

Hi

System reset -> HSE_B sBAF -> startup code(reset_handler) -> application

Best Regards,
Robin
-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "ACCEPT AS SOLUTION" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

[SCoder41]

Our S32K344 manages the power management chips that supply power to other modules, and requires S32K344 to enable these power management chips. If I wake up S32K344 from standby mode, it will perform a system reset from the reset handler to run the program, and other modules on our board will lose power. How can I solve this problem?

[Robin_Shen]

Please tell me the part number of power management chip. If you only need to maintain the S32K3 pin voltage, please read 7. Pad keeping in Standby mode of S32K3xx Low Power Management.pdf. 

[SCoder41]

TPS62135、TPS54J061RPGR and BQ25171Q1。Can I maintain the high output level of S32K344 gpio pin during the system reset period when S32K344 wakes up?

[Robin_Shen]

Yes.

Have a look at the Figure 8. Pad keeping flow of S32K3xx Low Power Management.pdf. All pins retain its last state from run mode during standby.
No matter pad keeping is enabled or not before going to standby mode, the GPIO will always retain the status set before going to standby mode. The function of pad keeping is mainly keep the GPIO mode between MCU reset to pad keeping disable(write DCM_GPR->DCMRWF1[STANDBY_IO_CONFIG] = 1).

[SCoder41]

So when my MCU wakes up from standby mode to RUN mode, can I keep the GPIO output high all the time?

[Robin_Shen]

Yes. Set the GPIO high and then write 1 to DCMRWF1[STANDBY_IO_CONFIG]:

It is recommended to use an oscilloscope to confirm the pin status.

[SCoder41]

thanks