使用单片机设计制作数字显示秒表

设计要求

1.采用单片机设计制作一个数显秒表；

2.具有计时启停、暂停与继续等功能；

硬件设计电路原理图

软件代码设计

#include <REGX52.H>

unsigned char shumaguan[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
unsigned int t=0;
unsigned int o=0;
unsigned char keyNum;
sbit2_7=2^7;
sbit2_6=2^6;

void Delay(unsigned int xms)	//设置延时函数
{
	unsigned char i, j;
	while(xms--)
	{
		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
	}
}

void Timer0_Init()  //配置定时器中断
{
	TMOD &= 0xF0;		//设置定时器模式
	TMOD |= 0x01;		//设置定时器模式
	TL0 = 0x18;		//设置定时初始值
	TH0 = 0xFC;		//设置定时初始值
	TR0 = 0;
	TF0 = 0;		//清除TF0标志
	ET0=1;     //配置中断
	EA=1;
	PT0=1;
}

unsigned char key()   //检测按键
{
	keyNum=0;
	if(P3_0==0)
	{
		Delay(20);
		keyNum=1;
	}
		if(P3_1==0)
	{
		Delay(20);
		keyNum=2;
	}
	if(P3_2==0)
	{
		Delay(20);
		keyNum=3;
	}
	if(P3_3==0)
	{
		Delay(20);
		keyNum=4;
	}

	return keyNum;
}

void shuzi(unsigned char location,number)  //数码管位数和显示数字
{
	P2_6=0;P2_7=1;
	switch(location)
	{
		case 1:P0_0=0;P0_1=1;P0_2=1;P0_3=1;P0_4=1;P0_5=1;P0_6=1;P0_7=1;break;
		case 2:P0_0=1;P0_1=0;P0_2=1;P0_3=1;P0_4=1;P0_5=1;P0_6=1;P0_7=1;break;
	}
	P2_6=1;P2_7=0;
	P0=shumaguan[number];
	Delay(1);
	P0=0xFF;
}

void Timer0_Routine() interrupt 1  //中断函数
{	
	TL0 = 0x18;		//设置定时初始值
	TH0 = 0xFC;		//设置定时初始值
	t++;
	if(t>=1000)
	{
		o++;
		t=0;
	}
}

void main()
{
	Timer0_Init();
	while(1)
	{
		keyNum=key();
		if(keyNum==1)    //开启
		{
			TR0 = 1;
		}
		if(keyNum==2)    //停止
		{
			TR0 = 0;
			o=0;
		}
		if(keyNum==3)    //暂停
		{
			TR0 = 0;
		}
		if(keyNum==4)      //继续
		{
			TR0 = 1;
		}
		shuzi(1,o/10%6);
		shuzi(2,o%10);
	}
}

作者：lsplhyqr