Module regs

Structs

• Cfg1
  configuration register 1
• Cfg2
  configuration register 2
• Cr1
  control register 1
• Cr2
  control register 2
• Crcpoly
  Polynomial Register
• Ier
  Interrupt Enable Register
• Ifcr
  Interrupt/Status Flags Clear Register
• Rxcrc
  Receiver CRC Register
• Rxdr
  Receive Data Register
• Sr
  Status Register
• Txcrc
  Transmitter CRC Register
• Txdr
  Transmit Data Register
• Udrdr
  Underrun Data Register