基于51单片机设计的数字钟
一：效果图如下
8位LED数码管显示，P3.7做时钟调节，P3.6做分钟调节，P3.5做秒钟调节；
二：原理图如下
//源程序代码如下
#include<regx51.h> // 包含51单片机寄存器定义的头文
unsigned char code disp[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40};
unsigned char code bitdisp[8]={0x00,0x04,0x08,0x0c,0x10,0x14,0x18,0x1c};
unsigned char buffer[8]={0,0,16,0,0,16,0,0};
unsigned char dispbitcnt;
unsigned int tcnt=0;
unsigned char second=0;
unsigned char count=0;
unsigned char minute=0;
unsigned char hour=12;
void delay10ms(void)
{
unsigned char i,j;
for(i=200;i>0;i--)
for(j=248;j>0;j--)
;
}
void t0(void) interrupt 1 using 0 //中断服务子程序
{
TH0=0x06;
TL0=0x06;
TR0=1;
if(count!=8)
{count++;}
else
{ count=0;
if(dispbitcnt!=8) //端口显示程序
{
P2=bitdisp[dispbitcnt];
P1=disp[buffer[dispbitcnt]];
dispbitcnt++;
}
else{dispbitcnt=0;}
if(tcnt!=400)
{tcnt++;}
else
{ tcnt=0;
if(second!=59)
{
second++;
}
else
{second=0;
if(minute!=59)
{
minute++;
}
else
{
minute=0;
if(hour!=23)
{hour++;}
else{hour=0;}
}
}
}
}
}
void initial(void) //中断初始化程序
{
TMOD=0x02;
TH0=0x06;
TL0=0x06;
TR0=1;
ET0=1;
EA=1;
}
void main(void)
{
initial();
while(1)
{
if((P3&0xe0)!=0xe0)
{
delay10ms();
if(P3_7==0)
{
if(hour!=23)
{hour++;}
else
{hour=0;}
}
else
{
if(P3_6==0)
{
if(minute!=59)
{
minute++;
}
else{minute=0;}
}
else
{delay10ms();
if(second!=59)
{
second++;
}
else
{second=0;}
}
}
}
buffer[0]=hour/10;
buffer[1]=hour%10;
buffer[3]=minute/10;
buffer[4]=minute%10;
buffer[6]=second/10;
buffer[7]=second%10;
}
}
