//Toggling P1 and P2 on MDE 8051 Trainer
//Tested by Mazidi 
//Modified from Example 7-8 in chapter 7 of the "8051 Microcontroller" textbook by Mazidis & McKinlay 
//Connect the LEDs to P1 and P2 and see they are toggling 
#include <reg51.h>
void MSDelay(unsigned int);
void main()
  {
    P1=0x0;
    P2=0x0;
    for(;;)
    {
    P1= 0x55;
    P2= 0x55;  	
    MSDelay(250);
    P1= 0xAA;
    P2= 0xAA;  	
    MSDelay(250);
    }     
  }

void MSDelay(unsigned int itime)
  {
    unsigned int i, j;
    for(i=0;i<itime;i++)           //Modify this this delay to see
      for(j=0;j<1275;j++);         //the rate of toggling
  }