Help¶

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

Says 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_SAM4S && 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/sam4s/Kconfig.soc:60

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_SAM4S_EXT_MAINCK
    bool "Atmel SAM4S to use external crystal oscillator for main clock"
    depends on SOC_SERIES_SAM4S && SOC_FAMILY_SAM
    help
      The main clock is being used to drive the PLL, and
      thus driving the processor clock.

      Says 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.

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