pwm2tt.c

用430做的PWM程序

#include<msp430x14x.h>

void main(void)
{
   unsigned int iq0;
   WDTCTL = WDTPW + WDTHOLD;               	//关闭看门狗

	//使用XT2振荡器
   BCSCTL1&=~XT2OFF;     				        //打开XT2振荡器
   do
   {
 		IFG1 &= ~OFIFG;				          // 清除振荡器失效标志
 		for (iq0 = 0xFF; iq0 > 0; iq0--);	 // 延时，等待XT2起振
 	}
 	while ((IFG1 & OFIFG) != 0);			    // 判断XT2是否起振

 	BCSCTL2 =SELM_2+SELS;				       //选择MCLK、SMCLK为XT2
 	
 	P1DIR |= 0X0C;
 	P1SEL |= 0X0C;
 	
 	CCR0 = 512 -1;
 	CCTL1 = OUTMOD_7;
 	
 	CCR1 = 384;
 	CCTL2 = OUTMOD_7;
 	CCR2 = 128;
 	
 	TACTL = TASSEL1+MC_1;
 	_BIS_SR(LPM3_bits);
 	
}