13.27.6.2.1 Initialization

The following registers are enable-protected, meaning that they can only be written when the ADC is disabled (CTRLA.ENABLE=0):

• Control B register (CTRLB)
• Reference Control register (REFCTRL)
• Event Control register (EVCTRL)
• Calibration register (CALIB)

Enable-protection is denoted by the "Enable-Protected" property in the register description.