2/2.c

#include<reg51.h>
#include<intrins.h>
sbit LED1 = P2^0;
sbit LED2 = P2^1;
sbit LED3 = P2^2;
sbit LED4 = P2^3;
sbit LED5 = P2^4;
sbit LED6 = P2^5;
sbit LED7 = P2^6;
sbit LED8 = P2^7;
unsigned char x;
void time1() interrupt 0 {
    if (P2 != 0xFF) {
        P2 = (P2 << 1) | 0x01;
    } else {
        P2 = 0xFE;
    }
		  //x = 0xFE;
			//x = _crol_(x,1);
			//P1 = x;
}

void main(){
	IE = 0X85;
	IT0 = 1;
	P2 = 0xFE;
	while(1);
}