之前使用的是外部时钟，但遇到一个问题，用对讲机在旁边通话的时候，芯片就死掉了，我在里面加了开门狗，连看门狗都不起作用了，问了下FAE，说改成片内晶振看看，我修改如下：
void SystemInit (void)
{
RCC->CR |= (uint32_t)0x00000001; /*HSI振荡器开启*/
/* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE, MCOSEL[2:0], MCOPRE[2:0] and PLLNODIV bits */
RCC->CFGR &= (uint32_t)0x08FFB80C;
/* Reset HSEON, CSSON and PLLON bits */
RCC->CR &= (uint32_t)0xFEF6FFFF;
/* Reset HSEBYP bit */
RCC->CR &= (uint32_t)0xFFFBFFFF;
/* Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */
RCC->CFGR &= (uint32_t)0xFFC0FFFF;
/* Reset PREDIV1[3:0] bits */
RCC->CFGR2 &= (uint32_t)0xFFFFFFF0;
/* Reset USARTSW[1:0], I2CSW, CECSW and ADCSW bits */
RCC->CFGR3 &= (uint32_t)0xFFFFFEAC;
/* Reset HSI14 bit */
RCC->CR2 &= (uint32_t)0xFFFFFFFE;
/* Disable all interrupts */
RCC->CIR = 0x00000000;
/* Configure the System clock frequency, AHB/APBx prescalers and Flash settings */
SetSysClock();
}
static void SetSysClock(void)
{
__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
/* Enable Prefetch Buffer and set Flash Latency */
FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;
/* HCLK = SYSCLK/4 */
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV4;
/* PCLK = HCLK/4 */
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE_DIV4;
/* PLL configuration */
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSI_DIV2 | RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLMULL6);
/* Enable PLL */
RCC->CR |= RCC_CR_PLLON;
/* Wait till PLL is ready */
while((RCC->CR & RCC_CR_PLLRDY) == 0)
{
}
/* Select PLL as system clock source */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;
/* Wait till PLL is used as system clock source */
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_PLL)
{
}
}
但这样修改之后，烧到芯片里面去，拿掉之前8M的晶振，芯片怎么都不工作，需要拿掉晶振脚上的电容吗？
还请高手指点下！
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