说明：此程序为博主参考其他程序按键一为时间与日期切换键；按键二为时间或日期调整键，即当显示时间时，每按一次依次显示小时、分钟、秒；当显示日期时，每按一次依次显示年、月、日；按键三和按键四依次为加键和减键，每按一次当松开时相应的变化一次。

#include
#define uchar unsigned char
#define uint unsigned int

sbit T_CLK = P1^0; //DS1302管脚定义
sbit T_IO = P1^1;
sbit T_RST = P1^2;

sbit KEY_1 = P1^3; //按键管脚定义
sbit KEY_2 = P1^4;
sbit KEY_3 = P1^5;
sbit KEY_4 = P1^6;

sbit ACC0 = ACC^0;
sbit ACC7 = ACC^7;

uchar DUAN_CODE[]={0X3F,0X06,0X5B,0X4F,0X66,0X6D,0X7D,0X07,0X7F,0X6F,0X0}; //共阴极数码管段码表
uchar BIT_CODE[]={0XFE,0XFD,0XFB,0XF7,0XEF,0XDF}; //数码管位选
uchar second,minute,hour,day,month,year,flag,keyvalue,value=0;
uchar Time[6]={0X0,0X0,0X0,0X0,0X0,0X0};
bit setsecond,setminute,sethour,setday,setmonth,setyear,distime=1,disdate=0;
void Delay(unsigned int i)
{
unsigned int j;
for(j=0;j}

unsigned char BCD2HEX(unsigned char BCDChar)
{
unsigned char temp;
temp=(BCDChar/16*10+BCDChar);
return temp;
}

unsigned char HEX2BCD(unsigned char HEXChar)
{
unsigned char temp;
temp=(HEXChar/10*16+HEXChar);
return temp;
}

void WriteByteDS1302(unsigned char Data)
{
unsigned char i;
ACC = Data;
for(i=8; i>0; i--)
{
T_IO = ACC0;
T_CLK = 1;
T_CLK = 0;
ACC = ACC >> 1;
}
}

unsigned char ReadByteDS1302(void)
{
unsigned char i;
for(i=8; i>0; i--)
{
ACC = ACC >>1;
ACC7 = T_IO;
T_CLK = 1;
T_CLK = 0;
}
return(ACC);
}

void WriteDS1302(unsigned char Addr,unsigned char Data)
{
T_RST = 0;
T_CLK = 0;
T_RST = 1;
WriteByteDS1302(Addr);
WriteByteDS1302(Data);
T_CLK = 1;
T_RST = 0;
}

unsigned char ReadDS1302(unsigned char Addr)
{
unsigned char Data;
T_RST = 0;
T_CLK = 0;
T_RST = 1;
WriteByteDS1302(Addr);
Data = ReadByteDS1302();
T_CLK = 1;
T_RST = 0;
return(Data);
}

void DS1302_INI() //设置ds1302函数，初始化时间和日期
{
WriteDS1302(0x8e,0x00); //关闭写保护，允许写操作
WriteDS1302(0x80,0x51); //秒
WriteDS1302(0x82,0x59); //分
WriteDS1302(0x84,0x12); //时
WriteDS1302(0x86,0x20); //日
WriteDS1302(0x88,0x05); //月
WriteDS1302(0x8c,0x12); //年
WriteDS1302(0x90,0xa5); //充电
WriteDS1302(0xc0,0xf0); //判断是否初始化一次标识写入
WriteDS1302(0x8e,0x80); //打开写保护，禁止写操作
}

void ReadTime()
{
second = BCD2HEX(Time[0]=ReadDS1302(0x81));
minute = BCD2HEX(Time[1]=ReadDS1302(0x83));
hour = BCD2HEX(Time[2]=ReadDS1302(0x85));
day = BCD2HEX(Time[3]=ReadDS1302(0x87));
month = BCD2HEX(Time[4]=ReadDS1302(0x89));
year = BCD2HEX(Time[5]=ReadDS1302(0x8d));

}

void Set(unsigned char sel,unsigned char selby)
{
unsigned char address,item;
unsigned char max,min;
if(sel==0) {address=0x80; max=59;min=0;} //秒
if(sel==1) {address=0x82; max=59;min=0;} //分钟
if(sel==2) {address=0x84; max=23;min=0;} //小时
if(month==2)
{
if(flag==1)
{
if(sel==3) {address=0x86; max=29;min=1;}
}
else
{
if(sel==3) {address=0x86; max=28;min=1;}
}
}
else
{
if(month==1|month==3|month==5|month==7|month==8|month==10|month==12)
{
if(sel==3) {address=0x86; max=31;min=1;}
}
if(month==4|month==6|month==9|month==11)
{
if(sel==3) {address=0x86; max=30;min=1;}
}
}
if(sel==4) {address=0x88; max=12;min=1;} //月
if(sel==5) {address=0x8c; max=99;min=0;} //年
item=ReadDS1302(address+1)/16*10+ReadDS1302(address+1);
if (selby==0) item++; else item--;
if(item>max) item=min;
if(itemWriteDS1302(0x8e,0x00);
WriteDS1302(address,item/10*16+item);
WriteDS1302(0x90,0xa5);
WriteDS1302(0x8e,0x80);
}
void Display()
{
uchar i=0;

for(i=0;i<6;i++)
{
P0=DUAN_CODE[Time[i]];
P2=BIT_CODE[i];
Delay(5);
P2=0xff;
}
}
void DisplayMode()
{
if(distime==1)
{
if(KEY_2==0)
{
Delay(10); //延时去抖
if(KEY_2==0)
{
while(KEY_2==0);
value++;
if(value>=4)value=0;
}
}
if(value==0)
{
sethour=0;
setminute=0;
setsecond=0;

setyear=0;
setmonth=0;
setday=0;

Time[0]=hour/10;
Time[1]=hour;
Time[2]=minute/10;
Time[3]=minute;
Time[4]=second/10;
Time[5]=second;
}
if(value==1)
{
sethour=1;
setminute=0;
setsecond=0;

setyear=0;
setmonth=0;
setday=0;
Time[0]=hour/10;
Time[1]=hour;
Time[2]=10;
Time[3]=10;
Time[4]=10;
Time[5]=10;
}
if(value==2)
{
sethour=0;
setminute=1;
setsecond=0;

setyear=0;
setmonth=0;
setday=0;

Time[0]=10;
Time[1]=10;
Time[2]=minute/10;
Time[3]=minute;
Time[4]=10;
Time[5]=10;
}
if(value==3)
{
sethour=0;
setminute=0;
setsecond=1;

setyear=0;
setmonth=0;
setday=0;

Time[0]=10;
Time[1]=10;
Time[2]=10;
Time[3]=10;
Time[4]=second/10;
Time[5]=second;
}
}
if(disdate==1)
{
if(KEY_2==0)
{
Delay(10); //延时去抖
if(KEY_2==0)
{
while(KEY_2==0);
value++;
if(value>=4)value=0;
}
}
if(value==0)
{
sethour=0;
setminute=0;
setsecond=0;

setyear=0;
setmonth=0;
setday=0;

Time[0]=year/10;
Time[1]=year;
Time[2]=month/10;
Time[3]=month;
Time[4]=day/10;
Time[5]=day;
}
if(value==1)
{
sethour=0;
setminute=0;
setsecond=0;

setyear=1;
setmonth=0;
setday=0;
Time[0]=year/10;
Time[1]=year;
Time[2]=10;
Time[3]=10;
Time[4]=10;
Time[5]=10;
}
if(value==2)
{
sethour=0;
setminute=0;
setsecond=0;

setyear=0;
setmonth=1;
setday=0;

Time[0]=10;
Time[1]=10;
Time[2]=month/10;
Time[3]=month;
Time[4]=10;
Time[5]=10;
}
if(value==3)
{
sethour=0;
setminute=0;
setsecond=0;

setyear=0;
setmonth=0;
setday=1;

Time[0]=10;
Time[1]=10;
Time[2]=10;
Time[3]=10;
Time[4]=day/10;
Time[5]=day;
}
}
}
void KeyCheck()
{
if(KEY_1==0)
{
Delay(5);
if(KEY_1==0)
{
keyvalue=1;
}
while(KEY_1==0)Display();
}
}
void KeyCheckADDorPLUS()
{
if(KEY_3==0)
{
Delay(5);
if(KEY_3==0)
{
while(KEY_3==0);
if(setsecond==1)Set(0,0);
else if(setminute==1)Set(1,0);
else if(sethour==1)Set(2,0);
else if(setday==1)Set(3,0);
else if(setmonth==1)Set(4,0);
else if(setyear==1)Set(5,0);
}

}
if(KEY_4==0)
{
Delay(5);
if(KEY_4==0)
{
while(KEY_4==0);
if(setsecond==1)Set(0,1);
else if(setminute==1)Set(1,1);
else if(sethour==1)Set(2,1);
else if(setday==1)Set(3,1);
else if(setmonth==1)Set(4,1);
else if(setyear==1)Set(5,1);
}

}
}
void ChangeDisplay()
{

if(keyvalue==1)
{
if(distime)
{
distime=0;
disdate=1;
}
else if(disdate)
{
distime=1;
disdate=0;
}
}
keyvalue=0;
}
void LeapYear(void)
{
if((year%4==0&&year0!=0)||(year0==0&&year@0==0))
{
flag=1;
}
else
{
flag=0;
}
if(flag==1&month==2&day==29&hour==0&minute==0&second==1)
{
WriteDS1302(0x8e,0x00);//允许写操作
WriteDS1302(0x88,0x03);
WriteDS1302(0x86,0x01);
WriteDS1302(0x90,0xa5);//充电
WriteDS1302(0x8e,0x80);//禁止写操作
}
if(flag==0&month==2&day==28&hour==0&minute==0&second==1)
{
WriteDS1302(0x8e,0x00);//允许写操作
WriteDS1302(0x88,0x03);
WriteDS1302(0x86,0x01);
WriteDS1302(0x90,0xa5);//充电
WriteDS1302(0x8e,0x80);//禁止写操作
}
}
void main()
{
DS1302_INI();
while(1)
{
KeyCheck();
ChangeDisplay();
ReadTime();
DisplayMode();
Display();
KeyCheckADDorPLUS();
DisplayMode();
LeapYear(); //闰年修正
}
}