MPC5744P debug mode succeed but stand-alone fail

[wenyenchen]

Dear Sir

We are now facing a problem in our own board which is using MPC5744P IC.

When I was using debug mode, the program runs normally and the function is correct,

but after leave debug mode, let the MCU runs as stand alone(also reset the power), the program cannot run normally, and the function is  incorrect.

We had checked the 40MHz oscillator and  VDD_LV_PLL0 , these two pin provides the correct voltage.

Do you have any suspect of this kind of issue or how can we troubleshooting to let the stand-alone mode succeed?

Thanks!

[wenyenchen · Accepted solution]

Dear Sir,

     Thank you for your information. In fact, I found it's hardware's fault. When I change the low side IC to high side IC, then it's work.

Thanks again.

         Sincerely,

BR Chiang

[martin_kovar]

Hello,

your description is too general for some specific advice. So, at first, please check, if you have disabled watchdog timer, or if you correctly refresh watchdog timer in standalone mode.

If watchdog handling is correct, please attach to microcontroller using debugger, while the microcontroller is running and look, where is the code and analyze status of your microcontroller.

Regards,

Martin