数码管电子秒表程序

1、数码管电子秒表程序        8位数码管电子秒表，显示精确到0.01秒。使用共阳数码管，51单片机的P0口输出段码，P2口输出位码。晶振11.0592MHz。        控制按钮K1接P1.0口，单片机检测低电平。第一次按下时，启动开始计时；第二次按下时，停止计时、显示当前值；第三次按下时，显示归零，做好重新计时准备。完整源程序：#include #include unsigned char data dis_digit;unsigned char

2、 key_s, key_v;unsigned char code dis_code11=0xc0,0xf9,0xa4,0xb0, / 0, 1, 2, 3    0x99,0x92,0x82,0xf8,0x80,0x90, 0xff;/ 4, 5, 6, 7, 8, 9, off unsigned char dis_buf8;  / 显示缓冲区unsigned char sec_bcd8;   / 秒计数值, BCD码unsigned char dis_index;  / unsign

3、ed char key_times;  / K1 按下次数   void clr_time(; void update_disbuf(;bit scan_key(;void proc_key(;void delayms(unsigned char ms;sbit K1 = P10;void main(void P0 = 0xff; P2 = 0xff; TMOD = 0x11;   / 定时器0, 1工作模式1, 16位定时方式 TH1 = 0x

4、dc; TL1 = 0; TH0 = 0xFC; TL0 = 0x17;  clr_time(;   /                        dis_digit = 0x7f;  / 初始显示P20口数码管 dis_index = 0;  

5、 /   key_times = 0; key_v = 0x01;  IE = 0x8a;   / 使能timer0, timer1中断  TR0 = 1; TR1 = 0; while(1   if(scan_key(     delayms(10;   if(scan_key(      

6、60;key_v = key_s;    proc_key(;        void clr_time( sec_bcd0 = 0x0; sec_bcd1 = 0x0; sec_bcd2 = 0x0; sec_bcd3 = 0x0; sec_bcd4 = 0x0; sec_bcd5 = 0x0; sec_bcd6 = 0x0; sec_bcd7 = 0x0;    

7、 update_disbuf(; bit scan_key( key_s = 0x00; key_s |= K1; return(key_s key_v; void proc_key( if(key_v & 0x01 = 0   key_times+;  if(key_times = 1     TR1 = 1;    else if(key_times = 2 

8、60;    TR1 = 0;    else     clr_time(;   key_times = 0;     void timer0( interrupt 1/ 定时器0中断服务程序, 用于数码管的动态扫描/ dis_index - 显示索引, 用于标识当前显示的数码管和缓冲区的偏移量/ dis_digit - 位选通值, 传送到P2口用于选通当前数码管的数值, 如等于0xfe

9、时,/    选通P2.0口数码管/ dis_buf   - 显于缓冲区基地址  TH0 = 0xFC; TL0 = 0x17;  P2 = 0xff;    / 先关闭所有数码管 P0 = dis_bufdis_index;  / 显示代码传送到P0口 P2 = dis_digit;    /  dis_digit = _cror_(dis_digit,1

10、; / 位选通值右移(P20<-P27, 下次中断时选通下一位数码管 dis_index+;    /       dis_index &= 0x07;   / 8个数码管全部扫描完一遍之后，再回到第一个开始下一次扫描void timer1( interrupt 3/  unsigned char i; TH1 |= 0xdc; for(i = 0; i < 8; i+ 

11、60; sec_bcdi+;   / 低位加1  if(sec_bcdi < 10  / 如果低位满10则向高位进1   break;   / 低位未满10  sec_bcdi = 0;   / 低位满10清0  update_disbuf(;   / 更新显示缓冲区void update_disbuf(/ 更新显示缓冲区 dis_buf0

12、= dis_codesec_bcd0; dis_buf1 = dis_codesec_bcd1; dis_buf2 = dis_codesec_bcd2 & 0x7f; / 加上小数点 dis_buf3 = dis_codesec_bcd3; dis_buf4 = dis_codesec_bcd4; dis_buf5 = dis_codesec_bcd5; dis_buf6 = dis_codesec_bcd6; dis_buf7 = dis_codesec_bcd7;void delayms(unsign

13、ed char ms / 延时子程序       unsigned char i; while(ms-   for(i = 0; i < 120; i+; #include     sbit ksec=P30; sbit kmin=P31; sbit khour=P32; sbit P33=P33; unsigned char  secshi=0,secge=0,mins

14、hi=0,minge=0,hourshi=0,hourge=0; unsigned int num=0,sec=0,min=0,hour=0,x,n; unsigned char code table10=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90; void delay(unsigned int; void keyscan(; void display(; main( TMOD=0x11; TH0=(65536-50000/256;  T

15、L0=(65536-50000%256;   TH1=(65536-50000/256;  TL1=(65536-50000%256; EA=1;ET0=1;TR0=1; TR1=0; ET1=1; while(1 display(;   keyscan(;   void delay(unsigned int z unsigned int x,y;  for(x=z;x>0;x-   for(y=110;y>0;y-; void ti

16、me0( interrupt 1 num+; TH1=(65536-50000/256;  TL1=(65536-50000%256; void time1( interrupt 3  n+;   TH0=(65536-50000/256;  TL0=(65536-50000%256;  void display( if(min=0 TR1=1; else TR1=0; if(n>10 n=0; P33=P33;      if(

17、num=20   num=0;     sec+;    if(sec=60    sec=0;    min+;    if(min=60     min=0;       hour+;       if(hour=24    

18、    hour=0;         min=0;         sec=0;                        secge=sec%10; secshi=sec/10; minge=min%1

19、0; minshi=min/10; hourge=hour%10; hourshi=hour/10; P2=1; P0=tablesecge; delay(5; P2=2; P0=tablesecshi; delay(5; P2=4; P0=191; delay(5; P2=8; P0=tableminge; delay(5; P2=16; P0=tableminshi; delay(5; P2=32; P0=191; delay(5;   P2=64; P0=tablehourge; delay(5;  P2=128; P0=tablehourshi; delay(5; void keyscan(  if(ksec=0   delay(10;    if(ksec=0    sec+;