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HSI-PLL 64Mhz Problem

Question asked by rovasata on Jun 12, 2013
Latest reply on Jun 12, 2013 by knik
I have STM32103C6 and my code goes well if I use HSE with PLL (72Mhz). But I try to have 64Mhz SYSCLK and HCLK using HSI. But every time when I am debugging, I see that after clock configuration, the code goes to HardFault_Handler. 
I know that before my main(), SystemInit() function (in system_stm32f10x.c file) is running. I commented out HSE freq definition like that: 
//#define SYSCLK_FREQ_72MHz  72000000
My code is below. What is my mistake?
Thank You.

int main(void)
    RCC_PLLConfig(RCC_PLLSource_HSI_Div2, RCC_PLLMul_16);     
    RCC->CR |= RCC_CR_PLLON; //Enable PLL     
    while((RCC->CR & RCC_CR_PLLRDY) == 0) //Wait till PLL is ready 
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));// Select PLL as system clock source
    RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;        
    while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)// Wait till PLL is used as system clock source