Help¶

This sets the APB3 prescaler which changes the frequency of APB3_CLK.
APB3_CLK frequency = OSC_CLK / APB3_PRE. The APB3 prescaler allowed
value is from 1 to 10.

The generated frequency of APB3_CLK should comply with the following
requirements:
- The frequency of APB3_CLK must be set to:
12.5MHz <= APB3_CLK <= 50MHz.
- The frequency of APB3_CLK must be an integer division (including 1)
of the frequency of the Core clock.

Direct dependencies¶

SOC_FAMILY_NPCX && CLOCK_CONTROL

(Includes any dependencies from ifs and menus.)

Default¶

2

Kconfig definition¶

At <Zephyr>/drivers/clock_control/Kconfig.npcx:55

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:32 → <Zephyr>/drivers/Kconfig:54 → <Zephyr>/drivers/clock_control/Kconfig:43

Menu path: (Top) → Device Drivers → Hardware clock controller support

config CLOCK_NPCX_APB3_PRESCALER
    int "APB3 prescaler"
    range 1 10
    default 2
    depends on SOC_FAMILY_NPCX && CLOCK_CONTROL
    help
      This sets the APB3 prescaler which changes the frequency of APB3_CLK.
      APB3_CLK frequency = OSC_CLK / APB3_PRE. The APB3 prescaler allowed
      value is from 1 to 10.

      The generated frequency of APB3_CLK should comply with the following
      requirements:
      - The frequency of APB3_CLK must be set to:
      12.5MHz <= APB3_CLK <= 50MHz.
      - The frequency of APB3_CLK must be an integer division (including 1)
      of the frequency of the Core clock.

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