32.5.3 Clocks

Two generic clocks are used by SERCOM, GCLK_SERCOMx_CORE and GCLK_SERCOMx_SLOW. The core clock (GCLK_SERCOMx_CORE) can clock the I²C when working as a host. The slow clock (GCLK_SERCOMx_SLOW) is required only for certain functions, e.g., SMBus timing. These two clocks must be configured and enabled in the CRU registers before using the I²C.

These generic clocks are asynchronous to the bus clock (PBx_CLK). Due to this asynchronicity, writes to certain registers will require synchronization between the clock domains.

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