Help¶

The main clock is being used to drive the PLL, and thus driving the processor clock.

Say y if you want to use external crystal oscillator to drive the main clock. Note that this adds about a second to boot time, as the crystal needs to stabilize after power-up.

The crystal used here can be from 3 to 20 MHz.

Says n here will use the internal fast RC oscillator running at 12 MHz.

Direct dependencies¶

SOC_SERIES_SAME70 && SOC_FAMILY_SAM && ARM

(Includes any dependencies from if’s and menus.)

Defaults¶

No defaults. Implicitly defaults to n.

Kconfig definition¶

At arch/arm/soc/atmel_sam/same70/Kconfig.soc:53

Included via Kconfig:10 → Kconfig.zephyr:23 → arch/Kconfig:16 → arch/arm/Kconfig:23 → arch/arm/soc/atmel_sam/Kconfig:17

Menu path: (top menu) → ARM Options → SoC Configuration

config SOC_ATMEL_SAME70_EXT_MAINCK
    bool
    prompt "Use external crystal oscillator for main clock" if SOC_SERIES_SAME70 && SOC_FAMILY_SAM && ARM
    depends on SOC_SERIES_SAME70 && SOC_FAMILY_SAM && ARM
    help
      The main clock is being used to drive the PLL, and
      thus driving the processor clock.

      Say y if you want to use external crystal oscillator
      to drive the main clock. Note that this adds about
      a second to boot time, as the crystal needs to
      stabilize after power-up.

      The crystal used here can be from 3 to 20 MHz.

      Says n here will use the internal fast RC oscillator
      running at 12 MHz.

(Definitions include propagated dependencies, including from if’s and menus.)