Module regs
- Ahbenr
 - AHB Peripheral Clock enable register (RCC_AHBENR)
 - Apb1enr
 - APB1 peripheral clock enable register (RCC_APB1ENR)
 - Apb1rstr
 - APB1 peripheral reset register (RCC_APB1RSTR)
 - Apb2enr
 - APB2 peripheral clock enable register (RCC_APB2ENR)
 - Apb2rstr
 - APB2 peripheral reset register (RCC_APB2RSTR)
 - Bdcr
 - Backup domain control register (RCC_BDCR)
 - Cfgr
 - Clock configuration register (RCC_CFGR)
 - Cfgr2
 - Clock configuration register 2
 - Cir
 - Clock interrupt register (RCC_CIR)
 - Cr
 - Clock control register
 - Csr
 - Control/status register (RCC_CSR)