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MC9S12XEP100 pin state while debugging

Question asked by Mesfin Bedada on Jan 15, 2020
Latest reply on Jan 16, 2020 by lama

What will be the I/O signal state when flashing an new firmware code in to a MC9S12XEP100 microcontroller? 


We are currently working on a project where pins from the micro are used as a switch to enable/disable a DC-DC charger and as a PWM control for the current limit. While testing the firmware developed, it was observed that when there is a new code is getting flashed on the micro (using Cyclone Pro) the voltage from the DC power supply is getting overloaded and varies rapidly. We hypothesized that may be the pin state change during flashing is setting the DC-DC set current high and also enabling Charging. Can you please elaborate on this? 


Please find attached the schematic for the micro pin connection below and let me know if you need more information.