定时器秒表99秒，按键可控

ID:320909 · 发表于 2018-5-12 20:40

中断，定时器，数码管动态显示
0~99秒定时器
按键按一下
开启显示00
再按一下开始计时
再按一下暂停
再按一下清0

一起学习

仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）

单片机源程序如下:

#include<reg51.h>
sbit p1=P1^0;
sbit p2=P1^1;
unsigned char code TAB[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
0x80,0x90};
unsigned char disp[2]={0xc0,0xc0};
unsigned char i=0;
unsigned int cnt =0;
void main(){
unsigned long sec =0;
EA=1;
TMOD=0x01;
TH0=0xfc;
TL0=0x18;
ET0=1;
TR0=1;
while(1){
if(cnt>=1000){
cnt=0;
sec++;
disp[0]=TAB[sec%10];
disp[1]=TAB[sec/10];
}
}
}
void inter0() interrupt 1{
TH0=0xfc;
TL0=0x18;
cnt++;
if(++i==3)i=1;
P2=0xff;
P1=~i;
P2=disp[i-1];
}

复制代码

所有资料51hei提供下载:

定时器秒表.rar (14.37 KB, 下载次数: 37)

ID:320909 · 发表于 2018-5-15 12:46

不好意思源码发错了现在补上，并且加上了 led 提示灯

ID:320909 · 发表于 2018-5-15 12:47

#include<reg51.h>
#define SEG P2
#define SCANP P1
sbit PB0=P1^7;
sbit led=P0^7;

#define count_M1 50000
#define TH_M1 (65636-count_M1)/256
#define TL_M1 (65636-count_M1)%256
int count_T0=0;

#define count_M2  250
#define TH_M2 (256-count_M2)
#define TL_M2 (256-count_M2)
char count_T1=0;

char code TAB[10]= {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x83,0xf8,0x80,0x98};
char disp[2]= {0xc0,0xc0};

char seconds=0;
char scan=0;
char flag=0;

void debouncer(void);
void delay(int x);
main() {

IE=0x8f;
TCON=0x00;
TMOD=0x21;
TH0=TH_M1;
TL0=TL_M1;
TR0=0;
TH1=TH_M2;
TL1=TL_M2;
TR1=0;

while(1) {


      if(PB0==0&&flag==0) {

         debouncer();
   led=0;
         TR0=1;
         TR1=1;
         TR0=0;
         flag=1;
         while(PB0==0);
         debouncer();

      }
      if(PB0==0&&flag==1) {
         debouncer();
         TR0=1;
         flag=2;
         while(PB0==0);
         debouncer();

      }
      if(PB0==0&&flag==2) {
         debouncer();
   led=0;
         TR0=0;
         flag=3;
         while(PB0==0);
         debouncer();

      }
      if(PB0==0&&flag==3) {
         debouncer();
         seconds=0;
         disp[0]=disp[1]=0xc0;
         TR0=0;
         flag=1;
         while(PB0==0);
         debouncer();

      }

}

}

void T0_1s(void)interrupt 1
{
TH0=TH_M1;
TL0=TL_M1;
if(++count_T0==16) //为了消除误差将20改为16
{
      count_T0=0;

   led=~led;

      seconds++;
      if(seconds==99)
         seconds=0;
}
disp[1]=TAB[seconds/10];
disp[0]=TAB[seconds%10];
}

void T1_8ms(void) interrupt 3
{
if(++count_T1==32)
{
      count_T1=0;
      if(++scan==3) scan=1;
      SEG=0xff;
      SCANP=~scan;
      SEG=disp[scan-1];
}
}

void debouncer(void)
{
int i;
for(i=0; i<2400; i++);
}

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