In STM32F103 there are 2 ADCs and in ATMEGA328 there are 5 ADCs, now, if I am using 3 of the 5 ADC channel in AVR to measure three different analog inputs, is it same as using 3 regular groups of either of ADC1 or ADC2 of the STM? or can we just using only two ADCs in STM? I am confused