freq = (unsigned int)((double)(Frequency) / (double)(XTAL_STEP));这行代码为什么会导致stm32进入硬件错误中断？

#define XTAL_STEP 0.95367431640625

unsigned int Frequency；
Frequency = 433000000；
unsigned int freq;
freq = (unsigned int)((double)(Frequency) / (double)(XTAL_STEP));

怀疑是XTAL_STEP被当成0作为除数参与运算了