AHB2 peripheral clock enable register
| GPIOAEN | IO port A clock enable |
| GPIOBEN | IO port B clock enable |
| GPIOCEN | IO port C clock enable |
| GPIODEN | IO port D clock enable |
| GPIOEEN | IO port E clock enable |
| GPIOFEN | IO port F clock enable |
| GPIOGEN | IO port G clock enable |
| GPIOHEN | IO port H clock enable |
| GPIOIEN | IO port I clock enable |
| OTGFSEN | OTG full speed clock enable |
| ADCEN | ADC clock enable |
| DCMIEN | DCMI clock enable |
| AESEN | AES accelerator clock enable |
| HASH1EN | HASH clock enable |
| RNGEN | Random Number Generator clock enable |