晶振損壞情況下的芯片運行情況

01找一塊開發(fā)板

02修改晶振

03編寫程序

void SystemInit (void){  /* Reset the RCC clock configuration to the default reset state(for debug purpose) */  /* Set HSION bit */  RCC->CR |= (uint32_t)0x00000001;
  /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */#ifndef STM32F10X_CL  RCC->CFGR &= (uint32_t)0xF8FF0000;#else  RCC->CFGR &= (uint32_t)0xF0FF0000;#endif /* STM32F10X_CL */       /* Reset HSEON, CSSON and PLLON bits */  RCC->CR &= (uint32_t)0xFEF6FFFF;
  /* Reset HSEBYP bit */  RCC->CR &= (uint32_t)0xFFFBFFFF;
  /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */  RCC->CFGR &= (uint32_t)0xFF80FFFF;
#ifndef STM32F10X_CL  /* Disable all interrupts and clear pending bits  */  RCC->CIR = 0x009F0000;#else  /* Reset PLL2ON and PLL3ON bits */  RCC->CR &= (uint32_t)0xEBFFFFFF;
  /* Disable all interrupts and clear pending bits  */  RCC->CIR = 0x00FF0000;
  /* Reset CFGR2 register */  RCC->CFGR2 = 0x00000000;#endif /* STM32F10X_CL */      /* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */  /* Configure the Flash Latency cycles and enable prefetch buffer */SetSysClock();}

GPIO_InitTypeDefGPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);    GPIO_InitStructure.GPIO_Pin = PB8_LOAD_PIN;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;    GPIO_Init(GPIOB, &GPIO_InitStructure);  
PB8_LOAD_1;

PB8_LOAD_1;                 //PB8輸出高電平DelayMs(100);               //延時PB8_LOAD_0;                 //PB8輸出低電平DelayMs(100);               //延時

特殊說明：