hi, Reading the UM2397 manual on page 12 chapter "Power supply" describes the possibility of powering the core through Vin in a voltage range of 7V-12V, I power it at 10v (the power supply can supply 500mA sufficient current for a core). The card then turns on and works, I need to read some variables, after a few minutes from switching on then via the USB I connect to the card AND WHEN I DO THIS THE VARIABLES ARE RESET (this is not a power problem to be of course I monitored the Vdd voltage of the µ through an oscilloscope, the power supply is constant at + 3.3V). I monitored with osilloscope so the Nrst signal when I insert the USB into the PC someone sends a reset signal. Thinking it was ST-Link I tried to remove the resistor R4 (attached diagram), (to remove any connection between µ and ST-LINK) but nothing has changed, when I insert the USB into the computer the variables are reset. SOMEONE KNOWS HOW TO PREVENT THIS FROM HAPPENING?
