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USART on STM32407 Discovery Board

Question asked by doolin74 on Dec 29, 2012
When trying to use the usarts on this discovery board I keep getting *** error 65: access violation at 0x40023800 : no 'read' permission and stops running at this line of code
  RCC->CR |= (uint32_t)0x00000001;
 /* Reset CFGR register */
  RCC->CFGR = 0x00000000;
 /* Reset HSEON, CSSON and PLLON bits */
  RCC->CR &= (uint32_t)0xFEF6FFFF;
can any one help me with this please?

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