基于单片机时钟24和12小时制设计

#include<reg51.h>

char code led_mod[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
int second,min,hour;	      
int setmin=0,sethour=0;	      
int currentmin,currenthour;   
bit flag=0;	                  
bit timeflag=1;				  
bit time24to12=1;             
bit amorpm=0;                 
sbit P16=P1^6;
unsigned char status;

void delay(int time)
{
	int i;
	for(;time>0;time--)
		for(i=0;i<250;i++);
}

int0_key() interrupt 0{		  
	flag=1;
	status=P0;
}

void sound(int n)
{