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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
{
	i