53.5.3 Clocks
The DAC bus clock (CLK_DAC_APB) can be enabled and disabled in the Main Clock module, and the default state of CLK_DAC_APB can be found in Peripheral Clock Masking.
A generic clock (GCLK_DAC) is required to clock the DAC Controller. This clock must be configured and enabled in the Generic Clock Controller before using the DAC Controller.
This generic clock is asynchronous to the bus clock (CLK_DAC_APB). Due to this asynchronicity, writes to certain registers will require synchronization between the clock domains. Refer to 53.6.8 Synchronization for further details.