The reason for S32K118 lockup

[L2250]

  The reality is that the reset pin is pulled down in about 820us period，and the high level continuous 700us. Probably the MCU is locked，and what is the cause for this phenomenon of lockup except for flash programming errors. similar to external circuit damage or hardware failure ?The program of software is correct.

Because I need to keep this fault, I didn't trigger mass erase .

[Robin_Shen · Accepted solution]

Hi 

Regarding Core Lockup, please read https://developer.arm.com/documentation/dui0662/b/The-Cortex-M0--Processor/Fault-handling/Lockup

Please make sure the MCU is not powered via an IO pin. Refer to the section "5 Common problems" of AN12130: Applying voltages to I/O pins when the processor is not powered. If the pin’s voltage level electrical specifications are violated, the processor can attempt a partial power up and/or puts the flash into an undefined state. This can lead to corruption of flash contents, corruption of flash control logic, or corruption of device configuration and trim values which in turn can lead to the processor reporting as secured (locked device) or failure of the processor to respond to and complete flash commands.

Regarding hardware, please refer to AN5426 Hardware Design Guidelines for S32K1xx Microcontrollers

Considering that you can read Chinese, please refer to S32K1xx系列MCU应用指南之芯片锁死(lockup)复位原因分析与恢复方法详解

Best Regards,
Robin
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[L2250]

Thanks for help !
A stable recurrent fault is that disconnecting physical layer when flash program through SWD；Basically, it can be determined that it was a programming error.