34.5.3 Clocks

A generic clock (GCLK_CCL) is optionally required to clock the CCL. This clock must be configured and enabled in the Generic Clock Controller (GCLK) before using input events, filter, edge detection or sequential logic. GCLK_CCL is required when input events, a filter, an edge detector or a sequential sub-module is enabled.

This generic clock is asynchronous to the user interface clock (PB2_CLK).