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simple stm32 c question ?

Question asked by adel.ahmed on May 10, 2013
Latest reply on Jun 18, 2014 by Clive One
what is this 1ul and 2ul and 3ul
examble
 RCC->AHB1ENR  |= ((1UL <<  0) );              /* Enable GPIOA clock         *
  GPIOA->MODER    &= ~((3UL << 2*0)  );         /* PA.0 is input              */
what is the new value for   RCC->AHB1ENR and   GPIOA->MODER

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