52.5.3 Clocks
The PCC bus clock (CLK_APB_PCC) is provided by the Main Clock Controller (MCLK) through the AHB-APB D bridge. The clock is enabled and disabled by writing the PCC bit the in the APB D Mask register (MCLK.APBDMASK.PCC). See the register description for the default state of the PCC bus clock.
For capturing operation, the external device has to provide a PCC clock signal (PCC_CLK) synchronous to the data received ("pixel clock") through a pin. See the PORT section and the Multiplexing table for details.
Writing any of the registers does not require the PCC_CLK to be enabled.