customer said:The function Device_cal() sets the default values for the ADCOFFTRIM and ADCREFTRIM registers to provide default calibration to offset and gain respectively. However, the default values for the ADCREFTRIM register are not optimal and the device shows significant full scale gain error. I have been manually adjusting the latter register in debug mode achieving better results and could program a routine to provide calibration to this register. My concern in this regards is that the ADC manual says in page 56, section 1.8.3 that “this register should not be modified after the Device_cal() function is called.” Could you please, further explain the reasons behind this recommendation?