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电源性能测试,使用AT89S52+AT24C02+LCD1602,编译通过,有掉电保护功能

#include <at89x51.h>
unsigned char buffer[4]={0,0,0,0}; 
void daojishi(void) 
{ 
  TMOD=0x02; 
  TH0=0x06; 
  TL0=0x06; 
  TR0=1; 
  ET0=1; 
  EA=1; 
} 
 
void t0(void) interrupt 1 using 0 
{ 
  unsigned int tcnt; 
  tcnt++; 
  if(tcnt==4000) 
    { 
      tcnt=0; 
      second--; 
      if(second==0) 
        { 
          second=59; 
          minite--; 
          if(minite==0) 
            { 
              minite=0; 
            } 
        } 
      buffer[3]=second%10; 
      buffer[2]=second/10; 
      buffer[1]=minite%10; 
      buffer[0]=minite/10; 
    }
}
void manxi(void)
{ 
  TMOD=0x10; 
  TH1=(65536-6000)/256; 
  TL1=(65536-6000)%256; 
  TR1=1; 
  ET1=1; 
  EA=1; 
} 
 


void t1(void) interrupt 3 using 2 
{ 
	  if(sflag)
	  { 
		  P3_0=0;
		  TH1=(65536-10000)/256; 
		  TL1=(65536-10000)%256;
         
		  sflag=0;
	  }
	  else
	  {   
		  P3_0=1;
		  TH1=(65536-60000)/256; 
		  TL1=(65536-60000)%256;
		 sflag=1 ; 
	  }
}