PLL_DITH_FDBK_M_SHIFT
num *= (val >> PLL_DITH_FDBK_M_SHIFT) & PLL_DITH_FDBK_M_MASK;
val &= ~(PLL_DITH_FDBK_M_MASK << PLL_DITH_FDBK_M_SHIFT);
PLL_DITH_FDBK_M_SHIFT;