Help¶

Say y if you want to use external 32 kHz crystal oscillator to drive the slow clock. Note that this adds a few seconds to boot time, as the crystal needs to stabilize after power-up.

Says n if you do not need accurate and precise timers. The slow clock will be driven by the internal fast RC oscillator running at 32 kHz.

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:41

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_SLCK
    bool
    prompt "Use external crystal oscillator for slow clock" if SOC_SERIES_SAME70 && SOC_FAMILY_SAM && ARM
    depends on SOC_SERIES_SAME70 && SOC_FAMILY_SAM && ARM
    help
      Say y if you want to use external 32 kHz crystal
      oscillator to drive the slow clock. Note that this
      adds a few seconds to boot time, as the crystal
      needs to stabilize after power-up.

      Says n if you do not need accurate and precise timers.
      The slow clock will be driven by the internal fast
      RC oscillator running at 32 kHz.

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