PLL46XX_KDIV_MASK
pll_con1 & PLL46XX_KDIV_MASK;
old_kdiv = (pll_con1 >> PLL46XX_KDIV_SHIFT) & PLL46XX_KDIV_MASK;
con1 &= ~((PLL46XX_KDIV_MASK << PLL46XX_KDIV_SHIFT) |