MSP430F149；二、基本时钟

拼搏现实的明天。 2022-02-12 11:07 249阅读 0赞

## 官方代码 ##

#include <msp430.h>
    
    int main(void)
    {
      WDTCTL = WDTPW +WDTHOLD;                  // Stop Watchdog Timer
      DCOCTL = DCO0 + DCO1 + DCO2;              // Max DCO
      BCSCTL1 = RSEL0 + RSEL1 + RSEL2;          // XT2on, max RSEL
      BCSCTL2 |= SELS;                          // SMCLK = XT2
      P5DIR |= 0x70;                            // P5.6,5,4 outputs
      P5SEL |= 0x70;                            // P5.6,5,5 options
    
      while(1)
      {
      }
    }

## 自己写 ##

#include "MSP430x14x.h"
    
    
    int main( void )
    {
      // Stop watchdog timer to prevent time out reset
      WDTCTL = WDTPW + WDTHOLD;
      
    
       
      /*DCO frequency select. */
      DCOCTL |=(BIT5+BIT6+BIT7);//=7;
      BCSCTL1 |= (RSEL0+RSEL1+RSEL2);//DCO MAX;
      
      /*ACLK*/
      //BCSCTL1 &= ~XTS;            //因为默认是0，所以可以不用设置;
      //BCSCTL1 &= ~(DIVA0+DIVA1);
      /*SMCLK*/
      BCSCTL1 &= ~XT2OFF;           //因为默认是1<关闭>，所以置1;
      BCSCTL2 &= ~SELS;             //1:外部时钟；0：DCO
      BCSCTL2 |= DIVS_1;            //2分频
      /*MCLK*/
      BCSCTL2 |= SELM_0;            //选择主系统的时钟源
      BCSCTL2 |= DIVM_0;            //1分频
      
      /*Oscillator fault interrupt enable*/
         __enable_interrupt();                     //开启中断;
    //  IE1 |= OFIE;                  //中断使能;这个不能置一，不知道为啥，置一就有问题，官方提供的例子也没有使OFIE置一，感觉好奇怪
      do
      {
    
      IFG1 &= ~OFIFG;               //中断标志位清零
      
      /*DELAY*/
      __no_operation();
      
      }
      while(IFG1&OFIFG);            //没有振荡器置位则跳出循环
      
      P5DIR |= 0x70;                            // P5.6,5,4 outputs
      P5SEL |= 0x70;                            // P5.6,5,5 options  
      
      for(;;);
      
    }