基于89C51的一个简单的警报系统

#include "reg52.h"
#define   uchar unsigned char
#define   uint  unsigned int

sbit light = P1^0
sbit loud = P1^7;
sbit alarm = P2^0;
bit alarm_flag,flag_dec,flag_change;

uint t0_count = 1;
uint t0_set,second;

void delay_1ms(unsigned int count) //1MS的延时×count
{
 unsigned int i,j;
 for(i=0;i