:orphan: .. title:: SOC_ATMEL_SAM4S_EXT_SLCK .. option:: CONFIG_SOC_ATMEL_SAM4S_EXT_SLCK *Atmel SAM4S to use external crystal oscillator for slow clock* Type: ``bool`` 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 =================== \ :option:`SOC_SERIES_SAM4S ` && \ :option:`SOC_FAMILY_SAM ` *(Includes any dependencies from ifs and menus.)* Defaults ======== No defaults. Implicitly defaults to ``n``. Kconfig definition ================== .. highlight:: kconfig At ``soc/arm/atmel_sam/sam4s/Kconfig.soc:48`` Included via ``Kconfig:8`` → ``Kconfig.zephyr:28`` → ``soc/Kconfig:11`` → ``/home/runner/work/bridle/bridle/workspace/build/Kconfig/Kconfig.soc.arch:2`` → ``soc/arm/atmel_sam/Kconfig:17`` Menu path: (Top) → Hardware Configuration .. parsed-literal:: config SOC_ATMEL_SAM4S_EXT_SLCK bool "Atmel SAM4S to use external crystal oscillator for slow clock" depends on \ :option:`SOC_SERIES_SAM4S ` && \ :option:`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.)*