#include<8051.h>

sfr at (0x80) LEDPORT;

/*
 *Function   :putchar
 *Description:put a character to uart use XOFF/XON protocol
 *parameter   :char
 *return      :none
*/

void Delay(void)
{
    int i,j;
    for (i=200;i>0;i--)
        for (j=248;j>0;j--)
            ;
}

void main(void)
{
    LEDPORT=0x00;
    Delay();
    while (1)
    {
        LEDPORT=~LEDPORT;
        Delay();
    }
}