时钟初始化do while语句跳不出来

只看该作者 · 2013-7-22 23:17

// 时钟初始化程序
void Clock_Init()
{
  unsigned char i;
  P5SEL=0X0C;
  P7SEL=0X00;
  //_bis_SR_register(SCG0);
  UCSCTL6=0X4001;                                  //打开XT2，XT1，SMCLK
  UCSCTL4|=SELM_5+SELS_5;                         //MCLK，SMCLK都选择XT2
  UCSCTL5|=DIVS_3+DIVM_0;                         //MCLK不分频，SMCLK8分频
  do
  {
UCSCTL7 &= ~(XT2OFFG);                // Clear XT1 & DCO fault flags
SFRIFG1 &= ~OFIFG;                   // Clear OSC Fault flag
for (i = 0xFF; i > 0; i--) ;          // Time for flag to set

  }while ( (SFRIFG1 & OFIFG) );
}