【1】在T0中断中，计时（如，20mS计50次后），到达1S，设秒标志。直接读取TH1，TL1的值保存到变量x。并清除T1计数值。
【2】在主程序中测到秒标志，清除，将x送显示单元。
【3】根据具体的LCD模块，组织图形数据，送LCD模块。
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【0】-初始化，【1】定时中断服务，【2】主监控程序，【3】LCD接口函数。
完成这四个部分，即可实现。自己完成吧。有问题再说。
顶层文件 万年历.C #include<reg51.h>#include "LCD1602.h" #include "DS1302.h" #define uchar unsigned char #define uint unsigned int sbit speaker=P2^4bit key_flag1=0,key_flag2=0SYSTEMTIME adjusteduchar sec_add=0,min_add=0,hou_add=0,day_add=0,mon_add=0,yea_add=0uchar data_alarm[7]={0}/************键盘控制******************************/ int key_scan() //扫描是否有键按下 { int i=0uint tempP1=0xf0temp=P1if(temp!=0xf0) i=1else i=0return i} uchar key_value() //确定按键的值 { uint m=0,n=0,tempuchar valueuchar v[4][3]={'2','1','0','5','4','3','8','7','6','b','a','9'} P1=0xfetemp=P1if(temp!=0xfe)m=0P1=0xfdtemp=P1 if(temp!=0xfd)m=1P1=0xfbtemp=P1 if(temp!=0xfb)m=2P1=0xf7temp=P1 if(temp!=0xf7)m=3P1=0xeftemp=P1 if(temp!=0xef)n=0P1=0xdftemp=P1 if(temp!=0xdf)n=1P1=0xbftemp=P1 if(temp!=0xbf)n=2value=v[m][n]return value} /***************************设置闹铃函数*******************************/ void naoling(void) { uchar i=0,l=0,jinit1602()while(key_flag2&&i<12) if(key_scan()){j=key_value()write_data(j)if(i%2==0)data_alarm[l]=(j-'0')*10else {data_alarm[l]+=(j-'0')l++}i++delay(600)} write_com(0x01)} uchar according(void) { uchar kif(data_alarm[0]==adjusted.Year&&data_alarm[1]==adjusted.Month&&data_alarm[2]==adjusted.Day&&data_alarm[3]==adjusted.Hour&&data_alarm[4]==adjusted.Minute&&data_alarm[5]==adjusted.Second) k=1else k=0return k} void speak(void) {uint i=50while(i) {speaker=0delay(1)speaker=1delay(1)i--} } void alarm(void) {uint i=10while(i) { speak()delay(10)i--} } /**************************修改时间 *** 作********************************/ void reset(void) { sec_add=0min_add=0hou_add=0day_add=0mon_add=0yea_add=0 } void adjust(void) { if(key_scan()&&key_flag1) switch(key_value()) {case '0':sec_add++breakcase '1':min_add++breakcase '2':hou_add++breakcase '3':day_add++breakcase '4':mon_add++breakcase '5':yea_add++breakcase 'b':reset()breakdefault: break} adjusted.Second+=sec_addadjusted.Minute+=min_addadjusted.Hour+=hou_addadjusted.Day+=day_addadjusted.Month+=mon_addadjusted.Year+=yea_addif(adjusted.Second>59) adjusted.Second=adjusted.Second%60if(adjusted.Minute>59) adjusted.Minute=adjusted.Minute%60if(adjusted.Hour>23) adjusted.Hour=adjusted.Hour%24if(adjusted.Day>31) adjusted.Day=adjusted.Day%31if(adjusted.Month>12) adjusted.Month=adjusted.Month%12if(adjusted.Year>100) adjusted.Year=adjusted.Year%100} /**************************中断处理函数*********************************/ void changing(void) interrupt 0 using 0 //需要修改时间和日期，或者停止修改 { if(key_flag1)key_flag1=0else key_flag1=1} void alarming(void) interrupt 3 using 0 //需要设置闹铃或者停止设置 { if(key_flag2)key_flag2=0else key_flag2=1} /********************************主函数***********************************/ main() {uint iuchar *luchar p1[]="D:",p2[]="T:"SYSTEMTIME TEA=1EX0=1IT0=1EA=1EX1=1IT1=1init1602()Initial_DS1302() while(1) { write_com(0x80)write_string(p1,2)write_com(0xc0)write_string(p2,2)DS1302_GetTime(&T) adjusted.Second=T.Secondadjusted.Minute=T.Minuteadjusted.Hour=T.Houradjusted.Week=T.Weekadjusted.Day=T.Dayadjusted.Month=T.Monthadjusted.Year=T.Yearfor(i=0i<9i++) { adjusted.DateString[i]=T.DateString[i]adjusted.TimeString[i]=T.TimeString[i]} adjust()if(key_flag2)naoling()if(according())alarm()DateToStr(&adjusted)TimeToStr(&adjusted)write_com(0x82)write_string(adjusted.DateString,8)write_com(0xc2)write_string(adjusted.TimeString,8)delay(10)} （二）头文件1 显示模块 LCD1602.H #ifndef LCD_CHAR_1602_2009_5_9 #define LCD_CHAR_1602_2009_5_9 #define uchar unsigned char #define uint unsigned int sbit lcdrs = P2^0sbit lcdrw = P2^1sbit lcden = P2^2void delay(uint z) // 延时 { uint x,yfor(x=zx>0x--) for(y=110y>0y--)} void write_com(uchar com) // 写入指令数据到 lcd { lcdrw=0lcdrs=0P0=comdelay(5)lcden=1delay(5)lcden=0} void write_data(uchar date) // 写入字符显示数据到 lcd { lcdrw=0lcdrs=1P0=datedelay(5)lcden=1delay(5)lcden=0} void init1602() // 初始化设定 { lcdrw=0lcden=0write_com(0x3C)write_com(0x0c)write_com(0x06)write_com(0x01)write_com(0x80)} void write_string(uchar *pp,uint n) { int ifor(i=0i<ni++) write_data(pp[i])} #endif (三)头文件2 时钟模块 DS1302.H #ifndef _REAL_TIMER_DS1302_2009_5_20_ #define _REAL_TIMER_DS1302_2003_5_20_ sbit DS1302_CLK = P2^6//实时时钟时钟线引脚 sbit DS1302_IO = P2^7//实时时钟数据线引脚 sbit DS1302_RST = P2^5//实时时钟复位线引脚 sbit ACC0 = ACC^0sbit ACC7 = ACC^7typedef struct SYSTEM_TIME { unsigned char Secondunsigned char Minuteunsigned char Hourunsigned char Weekunsigned char Dayunsigned char Monthunsigned char Yearunsigned char DateString[9]//用这两个字符串来放置读取的时间 unsigned char TimeString[9]}SYSTEMTIME//定义的时间类型 #define AM(X) X #define PM(X) (X+12) // 转成24小时制 #define DS1302_SECOND 0x80 #define DS1302_MINUTE 0x82 #define DS1302_HOUR 0x84 #define DS1302_WEEK 0x8A #define DS1302_DAY 0x86 #define DS1302_MONTH 0x88 #define DS1302_YEAR 0x8C #define DS1302_RAM(X) (0xC0+(X)*2) //用于计算 DS1302_RAM 地址的宏 /******内部指令**********/ void DS1302InputByte(unsigned char d) //实时时钟写入一字节(内部函数) { unsigned char iACC = dfor(i=8i>0i--) { DS1302_IO = ACC0DS1302_CLK = 1DS1302_CLK = 0ACC = ACC >>1//因为在前面已经定义了ACC0 = ACC^0以便再次利用DS1302_IO = ACC0} } unsigned char DS1302OutputByte(void) //实时时钟读取一字节(内部函数) { unsigned char ifor(i=8i>0i--) { ACC = ACC >>1ACC7 = DS1302_IODS1302_CLK = 1DS1302_CLK = 0} return(ACC)} /********************************/ void Write1302(unsigned char ucAddr, unsigned char ucDa) //ucAddr: DS1302地址, ucData: 要写的数据 { DS1302_RST = 0DS1302_CLK = 0DS1302_RST = 1DS1302InputByte(ucAddr)// 地址，命令 DS1302InputByte(ucDa)// 写1Byte数据 DS1302_CLK = 1DS1302_RST = 0} unsigned char Read1302(unsigned char ucAddr) //读取DS1302某地址的数据 { unsigned char ucDataDS1302_RST = 0DS1302_CLK = 0DS1302_RST = 1DS1302InputByte(ucAddr|0x01)// 地址，命令 ucData = DS1302OutputByte()// 读1Byte数据 DS1302_CLK = 1DS1302_RST = 0return(ucData)} void DS1302_SetProtect(bit flag) //是否写保护 { if(flag) Write1302(0x8E,0x10)else Write1302(0x8E,0x00)} void DS1302_SetTime(unsigned char Address, unsigned char Value) // 设置时间函数 { DS1302_SetProtect(0)Write1302(Address, ((Value/10)<<4 | (Value%10)))//将十进制数转换为BCD码 } //在DS1302中的与日历、时钟相关的寄存器存放的数据必须为BCD码形式 void DS1302_GetTime(SYSTEMTIME *Time) { unsigned char ReadValueReadValue = Read1302(DS1302_SECOND)Time->Second = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F)//将BCD码转换为十进制数 ReadValue = Read1302(DS1302_MINUTE)Time->Minute = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F)ReadValue = Read1302(DS1302_HOUR)Time->Hour = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F)ReadValue = Read1302(DS1302_DAY)Time->Day = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F)ReadValue = Read1302(DS1302_WEEK)Time->Week = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F)ReadValue = Read1302(DS1302_MONTH)Time->Month = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F)ReadValue = Read1302(DS1302_YEAR)Time->Year = ((ReadValue&0x70)>>4)*10 + (ReadValue&0x0F)} unsigned char *DataToBCD(SYSTEMTIME *Time) { unsigned char D[8]D[0]=Time->Second/10<<4+Time->Second%10D[1]=Time->Minute/10<<4+Time->Minute%10D[2]=Time->Hour/10<<4+Time->Hour%10D[3]=Time->Day/10<<4+Time->Day%10D[4]=Time->Month/10<<4+Time->Month%10D[5]=Time->Week/10<<4+Time->Week%10D[6]=Time->Year/10<<4+Time->Year%10return D} void DateToStr(SYSTEMTIME *Time) { //将十进制数转换为液晶显示的ASCII值 Time->DateString[0] = Time->Year/10 + '0'Time->DateString[1] = Time->Year%10 + '0'Time->DateString[2] = '-'Time->DateString[3] = Time->Month/10 + '0'Time->DateString[4] = Time->Month%10 + '0'Time->DateString[5] = '-'Time->DateString[6] = Time->Day/10 + '0'Time->DateString[7] = Time->Day%10 + '0'Time->DateString[8] = '\0'} void TimeToStr(SYSTEMTIME *Time) { //将十进制数转换为液晶显示的ASCII值 Time->TimeString[0] = Time->Hour/10 + '0'Time->TimeString[1] = Time->Hour%10 + '0'Time->TimeString[2] = ':'Time->TimeString[3] = Time->Minute/10 + '0'Time->TimeString[4] = Time->Minute%10 + '0'Time->TimeString[5] = ':'Time->TimeString[6] = Time->Second/10 + '0'Time->TimeString[7] = Time->Second%10 + '0'Time->DateString[8] = '\0'} void Initial_DS1302(void) { unsigned char SecondSecond=Read1302(DS1302_SECOND)if(Second&0x80) //初始化时间 DS1302_SetTime(DS1302_SECOND,0)} void DS1302_TimeStop(bit flag) // 是否将时钟停止 { unsigned char DataData=Read1302(DS1302_SECOND)DS1302_SetProtect(0)if(flag) Write1302(DS1302_SECOND, Data|0x80)else Write1302(DS1302_SECOND, Data&0x7F)} #endifzftzbpujjj1134358763，jaiezwwysu6517560870，2012-2-15 11:08:28要实现LCD1602上某字符的定时闪烁，有两种方法，一是用LCD1602的指令集中的指令开闪烁就行了。二是定时交替发送字符和空格两种字符，就可以实现闪烁了。
如写两行命令
write_com(0x0d) //关光标,开闪烁
write_com(0xc0+2+work*3)//指定闪烁位置
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