p273_s2.c

msp430开发版程序

//例2 使用内部参考源  P273
//内部参考源2.5V，通道A0的单次转换。
//#include "msp430x44x.h"

/*
将8路的精密可调电阻电路板接到P6口上观看运行效果，同时需要调节RP1
*/

#include "msp430x14x.h"
void main(void)
{
	volatile unsigned int i;
	WDTCTL = WDTPW + WDTHOLD;
	P6SEL |= 0x01;  //使能A/D通道A0
	ADC12CTL0 = ADC12ON + SHT0_2 + REFON + REF2_5V;
	ADC12CTL1 = SHP;
	ADC12MCTL0 = SREF_1;  //Vr+ = Vref+
	for (i=0;i<0x3600;i++)  //为参考源启动提供延迟
	{
	}
	ADC12CTL0 |= ENC;  //使能转换
	while(1)
	{
		ADC12CTL0 |= ADC12SC;  //开始转换
		while ((ADC12IFG & BIT0)==0);
		_NOP();	
	}		
}