#include

#define uint unsigned int

#define uchar unsigned char

sbit cs=P3^0;

sbit wr=P3^1;

void delay(uint z)

{

uchar i;

while(z--)

for(i=0;i<120;i++);

}

void main()

{

uint a;

while(1)

{

P2=a;

cs=0;

wr=1;

wr=0;

a++;

if(a==256)

a=0;

delay(1);

}

}