Help¶

Says 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_SAM4E && SOC_FAMILY_SAM

(Includes any dependencies from ifs and menus.)

Defaults¶

No defaults. Implicitly defaults to n.

Kconfig definition¶

At <Zephyr>/soc/arm/atmel_sam/sam4e/Kconfig.soc:28

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:28 → <Zephyr>/soc/Kconfig:11 → <BuildDir>/Kconfig/Kconfig.soc.arch:2 → <Zephyr>/soc/arm/atmel_sam/Kconfig:17

Menu path: (Top) → Hardware Configuration

config SOC_ATMEL_SAM4E_EXT_SLCK
    bool "Atmel SAM4E to use external crystal oscillator for slow clock"
    depends on SOC_SERIES_SAM4E && SOC_FAMILY_SAM
    help
      Says 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.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)