I'm trying to configure the ADC in a STM32F0 device. I notice in the RCC_APB2ENR register there is an ADCEN bit which seems to enable the peripheral clock. In all ADC example code I have not seen this bit being written to. My question is do I need to set this bit when I am using the ADC clocked from it's own 14MHz asynchronous clock and basically what is this bit for?