MPC5643L Boot without VDD_HV_ADR

jinjingyang — Mon, 19 Sep 2016 02:03:00 GMT

Dear Sir,

I tested on MPC5643L EVB and found that the MCU can boot without applying VDD_HV_ADR.

But it get stuck at the following code:

//ME_GS Wait for external osc to stabilize.

while(ME.GS.B.S_XOSC==0) {};

Even I applied 5V to VDD_HV_ADR at this moment, the software was still stuck here.

Then I reset the MCU and it can run normally and complete all clock initialization.

Can you help explain the above boot process? Why would I be stuck at the crystal initialization?

And customer's question is what's the max allowed delay between VDD_HV_ADR and other supplies for MCU to boot successfully at the very first time.

Regards,

Jason Yang

Re: MPC5643L Boot without VDD_HV_ADR

lukaszadrapa — Mon, 19 Sep 2016 04:57:11 GMT

Hi Jason,

I think that this note from datasheet explains everything:

Regards,

Lukas