/*************************************************************************************
                                                  P1口的應用（一）
****************************************************************************************/
#include"reg51.h"
#define uint unsigned int
#define uchar unsigned char
sbit DIPswitch=P1^2;
sbit blueLED=P1^0;
sbit greenLED=P1^1;
void main(void)
{
P1=0XFF;
while(1)
if (DIPswitch==1) 
   {blueLED=0;greenLED=1;}
   else
   {greenLED=0;blueLED=1;}
}