用C语言编写AT89C51单片机程序，设计一个智能数字钟。

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit QB1=P1^0;
sbit QB2=P1^1; //数码管段选
sbit QB3=P1^2;
sbit QB4=P1^3;
sbit QB5=P1^4;
sbit QB6=P1^5;
sbit fm=P1^6; //蜂