- #include "reg52.h"
- typedef unsigned int u16;
- typedef unsigned char u8;
- sbit LSA=P2^2;
- sbit LSB=P2^3;
- sbit LSC=P2^4;
- u8 code smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
- u16 s;
- u8 sec,mb[2];
- void Timer0Init()
- {
- TMOD|=0X01;
- TH0=0XFC;
- TL0=0X18;
- TR0=1;
- }
- void delay(u16 i)
- {
- while(i--);
- }
- void DigDisplay()
- {
- u8 i;
- for(i=0;i<3;i++)
- {
- switch(i)
- {
- case(0):
- LSA=0;LSB=0;LSC=0; break;
- case(1):
- LSA=1;LSB=0;LSC=0; break;
- case(2):
- LSA=0;LSB=1;LSC=0; break;
- }
- P0=smgduan[mb[i]];
- delay(1);
- P0=0x00;
- }
- }
- void main()
- {
- Timer0Init();
- while(1)
- {
- if(TF0==1)
- {
- TF0=0;
- TH0=0XFC;
- TL0=0X18;
- s++;
- }
- if(s==1000)
- {
- s=0;
- sec--;
- if(sec==0)sec=120;
- }
- mb[0]=sec%10;
- mb[1]=sec/10;
- mb[2]=sec/100;
- DigDisplay();
- }
- }
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