#include "msp430x41x.h"
void delay(unsigned int x)
{
  unsigned int i;
  for(i=x;i>0;i--);             //Delay
}

void main(void)
{
  unsigned int freq;	        //Define global variable
				//freq control speed,flash register time
  WDTCTL=WDTPW+WDTHOLD;		//Stop watchdog
  P5DIR|=0x01;			//P1 defined as out_pin
  freq=50000;			//The flash freqency determine by the soft delay
  for(;;)
    {
	delay(freq);		//The soft delay
	P5OUT^=0x02;		//The target P5.1 reverse output
    }
}