可以选的有
#define RCC_PLL3VCIRANGE_0 RCC_PLLCFGR_PLL3RGE_0 /*!< Clock range frequency between 1 and 2 MHz */
#define RCC_PLL3VCIRANGE_1 RCC_PLLCFGR_PLL3RGE_1 /*!< Clock range frequency between 2 and 4 MHz */
#define RCC_PLL3VCIRANGE_2 RCC_PLLCFGR_PLL3RGE_2 /*!< Clock range frequency between 4 and 8 MHz */
#define RCC_PLL3VCIRANGE_3 RCC_PLLCFGR_PLL3RGE_3 /*!< Clock range frequency between 8 and 16 MHz */