有谁可以发个在MS-51单片机上实现时钟功能的程序给我,

#include <reg51.h>
#include<stdio.h>

unsigned char ledbuf[8];
code unsigned char ledmap[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99,
0x92, 0x82, 0xf8, 0x80, 0x90}; //8段显示

void delay(unsigned char cnt)
{
unsigned char i;
while(cnt--!=0)
for(i=100;i!=0;i--);
}

#define tick 7554
#define T100us (256-134)
unsigned char hour,minute,second,ankey;
unsigned int c100us;

void sees()
{
ledbuf[0]=ledmap[hour/10];
ledbuf[1]=ledmap[hour%10];
ledbuf[2]=0xbf;
ledbuf[3]=ledmap[minute/10];
ledbuf[4]=ledmap[minute%10];
ledbuf[5]=0xbf;
ledbuf[6]=ledmap[second/10];
ledbuf[7]=ledmap[second%10];
}

void displayled()
{

char i;
unsigned char pos;
pos=0x01;
for(i=7;i>=0;i--)
{
P2=0x255;
P0=ledbuf[i];
P2=~pos;
delay(2);
P2=0x255;
pos<<=1;