MPC5744P

[amchengfeng]

I purchased a SPC5744PFMLQ9 (PIN-144), powered up after soldering, and found that its reset pin (PIN31) is always low, even if it is connected to a 5K pull-up resistor, it is still low. After connecting with the JTAG debugger, it will report an error when debugging, as shown below.

According to the S32DS prompt, I checked the reference manual, but I am not sure if the chip is locked. If it is locked, how should I unlock it?

I hope someone can help me, thanks.

[martin_kovar]

Hello,

your problem is not related to locked microcontroller. If reset line is always 0, this means, microcontroller is still in reset and this could be caused by many reasons.

I suppose you have your own board design (please write me if I am wrong). First of all, I recommend you to check all hints from MPC5744P hardware design guide, please see the link below.

https://www.nxp.com/docs/en/application-note/AN5267.pdf 

Especially, be sure your power supply design is correct.

Regards,

Martin