单片机数码管时钟

A. 51单片机6位数码管显示时间

C51单片机六位数码管时钟
用数码管dot分隔时分秒
用三个按键设置时间：
SET键：小时设定->分钟设定->结束设定，小时设定状态时表示小时的两位数码管闪烁，分钟设定时表示分钟的两位数码管闪烁
CHANGE键：在小时设定状态和分钟设定状态改变数值
SET S键：秒置零

C语言代码：
//main.c

#include <REGX52.H>
typedef unsigned int UINT ;
typedef unsigned char UCHAR ;
#define KEY P2
#define KEYMASK 0x07
sbit LE1 = P2^6; //定义位控口
sbit LE2 = P2^7; //定义段控口
UCHAR KeyPressDown = 0x00;
UCHAR KeyRelease = 0x00;
UCHAR LastKey = 0x00;
UCHAR MODE ;
extern UCHAR HH;
extern UCHAR MM;
extern UCHAR SS;
extern bit T_CYCLE ;
extern void T0_Init(void); //初始化定时器，函数定义在Timer.c
UCHAR code NUM[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};

void delay(UINT t) //延时t时钟周期
{
while (t--) ;
}

void H_Increase(void) //小时增1
{
if(HH<23) HH++;
else
{
HH = 0;
}
}

void M_Increase(void) //分钟增1
{
if(MM<59) MM++;
else
{
MM = 0;
H_Increase();
}
}

void S_Increase(void) //秒增1
{
if(SS<59) SS++;
else
{
SS = 0;
M_Increase();
}
}

void display(UCHAR SEG,UCHAR Digi) //显示一位数码管，SEG = 0-9数字，Digi = 第0-6位
{
LE2 = 1;
P0 = (0x01<<Digi) ;
LE2 = 0;
P0 = 0x00;
LE1 = 1;
P0 = NUM[SEG];
if (Digi==1||Digi==3) P0 &= 0x7f ; //显示分隔符
delay(50);
P0 = 0xff;
LE1 = 0;
}

void main(void)
{
P0 = 0xff;
LE1 = 0;
LE2 = 0;
T0_Init();
while(1)
{
if(MODE != 1 || T_CYCLE)
{
display(HH/10,0); //显示小时十位数
display(HH%10,1); //显示小时个位数
}
if(MODE != 2 || T_CYCLE)
{
display(MM/10,2); //显示分钟十位数
display(MM%10,3); //显示分钟个位数
}
display(SS/10,4); //显示秒十位数
display(SS%10,5); //显示秒个位数
}
}

void key_Process(void) //按键处理程序
{
UCHAR CurrKey;
KEY |= KEYMASK; //将按键对应的IO设置为输入状态
CurrKey = (~KEY) & KEYMASK;

KeyPressDown = (~LastKey) & CurrKey;
KeyRelease = LastKey & (~CurrKey);

LastKey = CurrKey;
switch(KeyRelease)
{
case 1:
if(MODE == 2) MODE = 0;
else MODE ++;
break;
case 2:
if(MODE == 1) H_Increase() ;
if(MODE == 2) M_Increase() ;
break;
case 4:
SS = 0;
break;
default: break;
}
}

//Timer.c

#include <reg52.h>
typedef unsigned int UINT ;
typedef unsigned char UCHAR ;
UCHAR HH = 14; //小时初始值
UCHAR MM = 2; //分钟初始值
UCHAR SS = 55; //秒初始值
UINT u_10ms = 0; //10ms计数
bit T_CYCLE = 0;
extern void key_Process(void);
extern void S_Increase(void);

void T0_Init(void)
{
TMOD &= 0xf0;
TMOD |= 0x01;
//定时器赋初始值，定时时间为10ms。
TH0 = 0xd8;
TL0 = 0xf0;
TR0 = 1;
IE = 0x82;

}

void T0_INTSrv(void) interrupt 1
{
//定时器重新开始计时。
TH0 = 0xd8;
TL0 = 0xf0;
u_10ms ++;
if (u_10ms%20==0) // 200 ms
{
T_CYCLE = ! T_CYCLE; //闪烁循环
}
if (u_10ms>99) // 1000 ms = 1 second
{
u_10ms = 0;
S_Increase();
}
key_Process(); //SET按键处理
}

Proreus仿真电路：

B. 51单片机控制数码管显示时钟，独立按键怎么弄

独立按键处理起来是非常简单的，一般都是IO口单独控制，所以只需要消抖和判断按键按下抬起状态就好。比如：
sbitkey=P1^0;
if(key==0)
{
delay(10);
if(key==0)
{
keyval=1;
while(key==0);
}
}