Module regs
- Brr
 - Port bit reset register (GPIOn_BRR)
 - Bsrr
 - Port bit set/reset register (GPIOn_BSRR)
 - Cr
 - Port configuration register (GPIOn_CRx)
 - Idr
 - Port input data register (GPIOn_IDR)
 - Lckr
 - Port configuration lock register
 - Odr
 - Port output data register (GPIOn_ODR)