PLL36XX_KDIV_MASK
kdiv = (s16)(pll_con1 & PLL36XX_KDIV_MASK);
old_kdiv = (pll_con1 >> PLL36XX_KDIV_SHIFT) & PLL36XX_KDIV_MASK;
pll_con1 &= ~(PLL36XX_KDIV_MASK << PLL36XX_KDIV_SHIFT);