//芯片MSP430F149

#include "io430.h"

//定义使用主频

#define CPU_F ((double)8000000)

//定义延时函数

#define delay_us(x) __delay_cycles((long)(CPU_F*(double)x/1000000.0))

#define delay_ms(x) __delay_cycles((long)(CPU_F*(double)x/1000.0))

void main( void )

{

unsigned char i;

WDTCTL = WDTPW + WDTHOLD;

P2DIR |= 0x01;

P5DIR |= 0x70;

BCSCTL1 &= ~XT2OFF;

BCSCTL1 += 0x30;

do

{

IFG1 &= ~OFIFG;

for(i = 0xFF;i > 0;i--);

}

while(IFG1 & OFIFG);

BCSCTL2 |= SELM_2;

//MCLK(主系统时钟采用外部高频晶振)

//SMCLK(子系统时钟采用内部DCO振荡器)

//ACLK(辅助系统时钟采用外部低频晶振)

P5SEL = BIT4+BIT5+BIT6;

while(1)

{

P2OUT ^= 0x01;

delay_us(10);

}

}

测试结果：