#include <reg52.h>
sbit ADDR2 = P1^2;
sbit ADDR1 = P1^1;
sbit ADDR0 = P1^0;
sbit ENLED = P1^4;
sbit ADDR3 = P1^3;
sbit LED2 = P0^0;
sbit KEY4 = P2^7;
void delay_ms(unsigned int x)
{
unsigned int i,j;
if(x==1000)
{
for(i=0;i<19601;i++)
{
for(j=5;j>0;j--);
}
}
else while(x--)for(j=115;j>0;j--);
}
void main()
{
ADDR3 = 1;
ENLED = 0;
ADDR2 = 1;
ADDR1 = 1;
ADDR0 = 0;
P2 = 0xF7;
while(1)
{
if(KEY4==0)
{
delay_ms(10);
if(KEY4==0)
{
LED2=!LED2;
while(KEY4==0);
}
}
}
}
