ADC common control register
| DUAL | Dual ADC mode selection  |  
| DELAY | Delay between 2 sampling phases  |  
| DMACFG | DMA configuration (for multi-ADC mode)  |  
| MDMA | Direct memory access mode for multi ADC mode  |  
| CKMODE | ADC clock mode  |  
| PRESC | ADC prescaler  |  
| VREFEN | VREFINT enable  |  
| CH17SEL | CH17 selection  |  
| CH18SEL | CH18 selection  |