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CONFIG_SOC_ATMEL_SAM3X_EXT_SLCK¶
Atmel SAM3 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¶
SOC_SERIES_SAM3X && SOC_FAMILY_SAM
(Includes any dependencies from if’s and menus.)
Defaults¶
No defaults. Implicitly defaults to n.
Kconfig definition¶
At soc/arm/atmel_sam/sam3x/Kconfig.soc:28
Included via Kconfig:10 → Kconfig.zephyr:27 → soc/Kconfig:12 → soc/arm/atmel_sam/Kconfig:18
Menu path: (top menu) → Hardware Configuration
config SOC_ATMEL_SAM3X_EXT_SLCK
bool
prompt "Atmel SAM3 to use external crystal oscillator for slow clock" if SOC_SERIES_SAM3X && SOC_FAMILY_SAM
depends on SOC_SERIES_SAM3X && 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.
(Definitions include propagated dependencies, including from if’s and menus.)