如题，下面贴上我的时钟设置代码：
#define PLL_SOURCE_HSI // HSI (~8MHz) used to clock the PLL, and the PLL is used as system clock source
static void SetSysClock(void)
{
__IO uint32_t StartUpCounter = 0, HSEStatus = 0;


#if defined (PLL_SOURCE_HSI)


FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;


RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;


RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE_DIV1;

RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSI_Div2 | RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLMULL12);


RCC->CR |= RCC_CR_PLLON;

while((RCC->CR & RCC_CR_PLLRDY) == 0)
{
}

RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;

while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_PLL)
{
}
#else
#if defined (PLL_SOURCE_HSE)

RCC->CR |= ((uint32_t)RCC_CR_HSEON);
#elif defined (PLL_SOURCE_HSE_BYPASS)

RCC->CR |= (uint32_t)(RCC_CR_HSEON | RCC_CR_HSEBYP);
#endif


do
{
HSEStatus = RCC->CR & RCC_CR_HSERDY;
StartUpCounter++;
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
{
HSEStatus = (uint32_t)0x01;
}
else
{
HSEStatus = (uint32_t)0x00;
}
if (HSEStatus == (uint32_t)0x01)
{

FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;


RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;


RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE_DIV1;

RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_PREDIV1 | RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLMULL6);


RCC->CR |= RCC_CR_PLLON;

while((RCC->CR & RCC_CR_PLLRDY) == 0)
{
}

RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;

while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_PLL)
{
}
}
else
{
}
#endif
}


当我调试到
RCC->CR |= RCC_CR_PLLON;这条语句的时候，仿真器就不能调试了
不知是怎么回事？