AnsweredAssumed Answered

MPC5777m DCF Client Configuration

Question asked by John Ramoul on Feb 6, 2017
Latest reply on May 3, 2017 by jschloss

Hello all, 


I am currently working with the MPC5777m and would like to configure my GPIOs to a 3.3V instead of 5V. In the Datasheet it mentions the following: 


"In order to use 3.3 V on the VDD_HV_IO_MAIN0 physical I/O segment, the HV supply low voltage monitor (VLVD400)
must be disabled by DCF client." 


I am very lost on how I am supposed to reprogram the DCF Client records for the MPC5777m such that i can get a 3.3V GPIO.


I am using the MPC5xxx Motherboard and 512DS daughter board which as of hardware it seems simple to just switch from the 5V SR supply to 3.3V SR supply. I have also configured the necessary PMCDIG.VSIO.R register to accept 3.3V for my GPIO but when i switch the jumper to 3.3V the microcontroller becomes in reset mode and I cannot program it anymore. 


Any help is appreciated,
Thank you.
Sincerely John Ramoul.