main.c

是MSP430F2274的源代码

#include "msp430x22x4.h"
#include "Clock_def.h"
//用显波器来观察以下管脚
//并通过修改"Clock_def.h"文件来定义各个时钟
//                 MSP430F2274
//             -----------------
//         /|\|              XIN|-  
//          | |                 |
//          --|RST          XOUT|-
//            |             P1.4|---->SMCLK
//            |             p2.0|---->ACLK
//            |             P2.1|---->SMCLK     
int main( void )
{
  WDTCTL=WDTPW+WDTHOLD;         //关看门狗

#if(DCO_FREQUENCY==1)
  BCSCTL1=CALBC1_1MHZ;	        //设定DCO为1MHZ
  DCOCTL=CALDCO_1MHZ;
#elif  (DCO_FREQUENCY==8)
  BCSCTL1=CALBC1_8MHZ;	        //设定DCO为8MHZ
  DCOCTL=CALDCO_8MHZ;
#elif  (DCO_FREQUENCY=12)
  BCSCTL1=CALBC1_12MHZ;	        //设定DCO为12MHZ
  DCOCTL=CALDCO_12MHZ;
#elif   (DCO_FREQUENCY=16)
  BCSCTL1=CALBC1_16MHZ;	        //设定DCO为16MHZ
  DCOCTL=CALDCO_16MHZ;     
#endif        
  P1SEL |=BIT4;                 //P1.4输出SMCLK
  P1DIR |=BIT4;
  P2SEL |=BIT0+BIT1;            //P2.1输出SMCLK,P2.0输出ACLK
  P2DIR |=BIT0+BIT1; 
  
#ifdef  ACLK_VLOCLK        
  
    BCSCTL3 |=LFXT1S1;          //ACLK来源VLO
#endif 

#ifdef  SMCLK_LFC
    BCSCTL2 |=SELS;             //SMCLK来源LFC(LFXT1CLK或VLOCLK由ACLK_VLOCLK决定)
#endif

#ifdef  MCLK_XT2_OR_LFC         //MCLK时钟源选择设定
       BCSCTL2 |=SELM1; 
#endif  
  return 0;  
}