@classmethod
def get_cpu_mhz(mcs):
    """The getter method for the CPU clock.

        Returns
        -------
        float
            The CPU clock rate measured in MHz.

        """
    arm_src_pll_idx = mcs.ARM_CLK_CTRL[mcs.ARM_CLK_SRC_FIELD]
    arm_clk_odiv = mcs.ARM_CLK_CTRL[mcs.ARM_CLK_ODIV_FIELD]
    src_pll_reg = mcs.ARM_SRC_PLL_CTRLS[arm_src_pll_idx]
    return round(mcs.get_pll_mhz(src_pll_reg) / arm_clk_odiv, 6)
