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- //可實(shí)現(xiàn)計(jì)時(shí)功能，最大計(jì)時(shí)時(shí)間為99小時(shí)。
- //支持暫停功能，按鍵盤(pán)中左下角的S2鍵，可暫停計(jì)時(shí);按下S3，可繼續(xù)計(jì)時(shí)。
- //注意晶振需為11.0592M。
- //若為其他數(shù)值晶振，請(qǐng)改變TH0與TL0參數(shù)值，否則計(jì)時(shí)會(huì)有很大誤差 。
- #include<reg51.h>
- #define uchar unsigned char
- sbit dula=P2^6;
- sbit wela=P2^7;
- sbit beep=P2^3;
- sbit S2=P3^0;
- sbit S3=P3^1;
- unsigned char halt,j,k,a1,a0,b1,b0,c1,c0,s,f,m,n=255;
- unsigned int pp;
- unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
- 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
- void delay(unsigned char i)
- {
- for(j=i;j>0;j--)
- for(k=125;k>0;k--);
- }
- void display(uchar shi2,uchar shi1,uchar fen2,uchar fen1,uchar miao2,uchar miao1)
- {
- dula=0;
- P0=table[shi2];
- dula=1;
- dula=0;
-
- wela=0;
- P0=0xfe;
- wela=1;
- wela=0;
- delay(5);
-
- P0=table[shi1]|0x80;
- dula=1;
- dula=0;
-
- P0=0xfd;
- wela=1;
- wela=0;
- delay(5);
- P0=table[fen2];
- dula=1;
- dula=0;
-
- P0=0xfb;
- wela=1;
- wela=0;
- delay(5);
-
- P0=table[fen1]|0x80;
- dula=1;
- dula=0;
-
- P0=0xf7;
- wela=1;
- wela=0;
- delay(5);
-
- P0=table[miao2];
- dula=1;
- dula=0;
-
- P0=0xef;
- wela=1;
- wela=0;
- delay(5);
-
- P0=table[miao1];
- dula=1;
- dula=0;
-
- P0=0xdf;
- wela=1;
- wela=0;
- delay(5);
- }
- void keyscan()
- {
- if(S2==0)
- delay(10);
- if(S2==0)
- {
- halt=1;
- }
- if(S3==0)
- halt=0;
- }
- void main()
- {
- TMOD=0x01;
- TR0=1;
- TH0=(65536-46080)/256;// 由于晶振為11.0592,故所記次數(shù)應(yīng)為46080，計(jì)時(shí)器每隔50000微秒發(fā)起一次中斷。
- TL0=(65536-46080)%256;//46080的來(lái)歷，為50000*11.0592/12
- ET0=1;
- EA=1;
- while(1)
- { keyscan();
- if(halt==0)
- {
- TR0=1;
- if(pp==20)
- { pp=0;
- m++;
- n--;
- P1=n;//閃爍燈
- if(m==60)
- {
- m=0;
- f++;
- if(f==60)
- {
- f=0;
- s++;
- if(s==99)
- {
- s=0;
- }
- }
- }
- }
-
- a0=s%10;
- a1=s/10;
- b0=f%10;
- b1=f/10;
- c0=m%10;
- c1=m/10;
- display(a1,a0,b1,b0,c1,c0);
- }
- else
- TR0=0;
- display(a1,a0,b1,b0,c1,c0);
- }
- }
- void time0() interrupt 1
- {TH0=(65536-46080)/256;
- TL0=(65536-46080)%256;
- pp++;
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