include "reg52.h"

typedef unsigned int u16; typedef unsigned char u8;

sbit LSA=P2^2; sbit LSB=P2^3; sbit LSC=P2^4;

sbit begin =P3^1; sbit stop =P3^2; sbit reset =P3^3;

u8 code smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

u8 code table1[10]={0xbf,0x86,0xdb,0xcf,0xe6, 0xed,0xfd,0x87,0xff,0xef};

  u8 ssec,sec,min;

  u8 DisplayData[4];

void delay(u16 i) { while(i--); }

void Timer0Init() { TMOD|=0X01;

TH0=0Xd8; //10ms TL0=0Xf0; ET0=1; EA=1; TR0=0; }

void DigDisplay() { u8 i; for(i=0;i<4;i++) { switch(i) { case(0): LSA=1;LSB=1;LSC=1; break; case(1): LSA=0;LSB=1;LSC=1; break; case(2): LSA=1;LSB=0;LSC=1; break; case(3): LSA=0;LSB=0;LSC=1; break;

} P0=DisplayData[i]; delay(100); P0=0x00; } }

void datapros() { DisplayData[0]=smgduan[min/10]; DisplayData[1]=table1[min%10]; DisplayData[2]=smgduan[sec/10]; DisplayData[3]=smgduan[sec% 10];

}

void main() { Timer0Init(); while(1) {

if(begin==0) delay(1000); { if(begin==0) { TR0=1; while(!begin); } }

if(stop==0) delay(1000); { if(stop==0) { TR0=0; while(! stop); } }

if(reset==0) { delay(1000); if(reset==0) { TR0=0; sec=0; min=0; ssec=0; while(!reset); } }

datapros(); DigDisplay(); } }

void Timer0() interrupt 1 { TH0=0Xd8; TL0=0Xf0; ssec++; if(ssec>=100) { ssec=0; sec++; if(sec>=60) { sec=0; min++;

if(min>=60) { ssec=0; sec=0; min=0; } } } }