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#include
#define uchar unsinged char #define int unsinged int ***it dula=P2^6; ***it rs=P3^5; ***it lcden=P3^4; ***it s1=P3^0; ***it s2=P3^1; ***it s3=P3^2; ***it s4=P3^6; ***it rd=P3^7; ***it beep=P2^3; ***it dscs=P1^4; ***it dsas=P1^5; ***it dsrw=P1^6; ***it dsds=P1^7; ***it dsirp=P3^3; bit flag1,flag_ri; uchar count,slnum,flag,t0_num; char miao,shi,fen,year,month,day,week,amiao,afen,ashi; uchar code table[]="20 - - "; uchar code table1[]=" : : "; void write_ds(uchar,uchar); void ste_alarm(uchar,uchar,uchar); void read_alarm(); void read_ds(uchar); void set_time(); void delay(uint z)//延时函数 { uint x,y; for(x=z;x>0;x--) for(y=110;y>0;y--); } void di() //蜂鸣器报警声音 { beep=0; delay(100); beep=1; } */ void write_com(uchar com) {//写液晶命令函数 rs=0; lcden=0; P0=com; delay(3); lcden=1; delay(3); lcden=0; } void write_date(uchar date) {//写液晶数据函数 rs=1; lcden=0; P0=date; delay(3); lcden=1; delay(3); lcden=0; } void init() {//初始化函数 uchar num; EA=1;//打开总中断 EX1=1;//开外部中断1 IT1=1;//设置负跳变沿触发中断 flag1=0;//变量初始化 t0_num=0; s1num=0; week=1; dula=0;//关闭数码管显示 wela=0; lcden=0; rd=0; /*以下几行在首次设置DS12C887时使用，以后不必再写入 write_ds(0x0A,0x20);//打开振荡器 write_ds(0x0B,0x26);//设置24小时模式，数据二进制格式 //开启闹铃中断 set_time();//设置上电默认时间 -----------------------------------------------------*/ write_com(0x38);//1602液晶初始化 write_com(0x0c); write_com(0x06); write_com(0x01); write_com(0x80); for(num=0;num<15;num++)//写入液晶固定部分显示 { write_date(table[num]); delay(1); } write_com(0x80+0x40); for(num=0;num<11;num++) { write_date(table1[num]); delay(1); } } void write_sfm(uchar add,char date) {//1602液晶刷新时分秒函数4为时，7为分，10为秒 char shi,ge; shi=date/10; ge=date%10; write_com(0x80+0x40+add); write_date(0x30+shi); write_date(0x30+ge); } void write_nyr(uchar add,char date) {//1602液晶刷新年月日函数3为年，6为分，9为秒 char shi,ge; shi=date/10; ge=date%10; write_com(0x80+add); write_date(0x30+shi); write_date(0x30+ge); } void write_week(char we) {//写液晶星期显示函数 write_com(0x80+12); switch(we) { case 1: write_date('M');delay(5); write_date('O');delay(5); write_date('N'); break; case 2: write_date('T');delay(5); write_date('U');delay(5); write_date('E'); break; case 3: write_date('W');delay(5); write_date('E');delay(5); write_date('D'); break; case 4: write_date('T');delay(5); write_date('H');delay(5); write_date('U'); break; case 5: write_date('F');delay(5); write_date('R');delay(5); write_date('I'); break; case 6: write_date('S');delay(5); write_date('A');delay(5); write_date('T'); break; case 7: write_date('S');delay(5); write_date('U');delay(5); write_date('N'); break; } } void keyscan() { if(flag_ri==1) {//这里用来取消闹钟报警，任一键取消报警 if((s1==0)||(s2==0)||(s3==0)||(s4==0)) { delay(5); if((s1==0)||(s2==0)||(s3==0)||(s4==0)) { while(!(s1&&s2&&s3&&s4)); di(); flag_ri=0;//清除报警标志 } } } if(s1==0)//检测S1 { delay(5); if(s1==0) { s1num++;//记录按下次数 if(flag1==1) if(s1num==4) s1num=1; flag=1; while(!s1);di(); switch(s1num) {//光标闪烁点定位 case 1: write_com(0x80+0x40+10); write_com(0x0f); break; case 2: write_com(0x80+0x40+7); break; case 3: write_com(0x80+0x40+4); break; case 4: write_com(0x80+12); break; case 5: write_com(0x80+9); break; case 6: write_com(0x80+6); break; case 7: write_com(0x80+3); break; case 8: s1num=0; write_com(0x0c); flag=0; write_ds(0,miao); write_ds(2,fen); write_ds(4,shi); write_ds(6,week); write_ds(7,day); write_ds(8,month); write_ds(9,year); break; } } } if(s1num!=0)//只有当S1按下后，才检测S2和S3 { if(s2==0) { delay(1); if(s2==0) { while(!s2);di(); switch(s1num) {//根据功能键次数调节相应数值 case 1: miao++; if(miao==60) miao=0; write_sfm(10,miao); write_com(0x80+0x40+10); break; case 2: fen++; if(fen==60) fen=0; write_sfm(7,fen); write_com(0x80+0x40+7); break; case 3: shi++; if(shi==24) shi=0; write_sfm(4,shi); write_com(0x80+0x40+4); break; case 4: week++; if(week==8) week=1; write_week(week); write_com(0x80+12); break; case 5: day++; if(day==32) day=1; write_nyr(9,day); write_com(0x80+9); break; case 6: month++; if(month==13) month=1; write_nyr(6,month); write_com(0x80+6); break; case 7: year++; if(year==100) year=0; write_nyr(3,year); write_com(0x80+3); break; } } } if(s3==0) { delay(1); if(s3==0) { while(!s3);di(); switch(s1num) {//根据功能键次数调节相应数值 case 1: miao--; if(miao==-1) miao=59; write_sfm(10,miao); write_com(0x80+0x40+10); break; case 2: fen--; if(fen==-1) fen=59; write_sfm(7,fen); write_com(0x80+0x40+7); break; case 3: shi--; if(shi==-1) shi=23; write_sfm(4,shi); write_com(0x80+0x40+4); break; case 4: week--; if(week==0) week=7; write_week(week); write_com(0x80+12); break; case 5: day--; if(day==0) day=31; write_nyr(9,day); write_com(0x80+9); break; case 6: month--; if(month==0) month=12; write_nyr(6,month); write_com(0x80+6); break; case 7: year--; if(year==-1) year=99; write_nyr(3,year); write_com(0x80+3); break; } } } } if(s4==0)//检测S4 { delay(5); if(s4==0) { flag1=~flag1; while(!s4);di(); if(flag1==0) {//退出闹钟设置时保存数值 flag=0; write_com(0x80+0x40); write_date(' '); write_date(' '); write_com(0x0c); write_ds(1,miao); write_ds(3,fen); write_ds(5,shi); } else {//进入闹钟设置 read_alarm();//读取原始数据 miao=amiao;//重新赋值用以按键调节 fen=afen; shi=ashi; write_com(0x80+0x40); write_date('R');//显示标志 write_date('i'); write_com(0x80+0x40+3); write_sfm(4,ashi);//送液晶显示闹钟时间 write_sfm(7,afen); write_sfm(10,amiao); } } } } void write_ds(uchar add,uchar dat) {//写12C887函数 dscs=0; dsas=1; dsds=1; dsrw=1; P0=add;//先写地址 dsas=0; dsrw=0; P0=date;//再写数据 dsrw=1; dsas=1; dscs=1; } uchar read_ds(uchar add) {//读12C887函数 uchar ds_date; dsas=1; dsds=1; dsrw=1; dscs=0; P0=add;//先写地址 dsas=0; dsds=0; P0=0xff; ds_date=P0;//再读数据 dsds=1; dsas=1; dscs=1; return ds_date; } /*---首次操作12C887时给予寄存器初始化--- void set_time() {//首次上电初始化时间函数 write_ds(0,0); write_ds(1,0); write_ds(2,0); write_ds(3,0); write_ds(4,0); write_ds(5,0); write_ds(6,0); write_ds(7,0); write_ds(8,0); write_ds(9,0); } ----------------------------------------*/ void read_alarm() {//读取12C887闹钟值 amiao=read_ds(1); afen=read_ds(3); ashi=read_ds(5); } void main()//主函数 { init();//调用初始化函数 while(1) { keyscan();//按键扫描 if(flag_ri==1)//当闹钟中断时进入这里 { di(); delay(100); di(); delay(500); } if(flag==0&&flag1==0)//正常工作时进入这里 { keyscan();//按键扫描 year=read_ds(9);//读取12C887数据 month=read_ds(8); day=read_ds(7); week=read_ds(6); shi=read_ds(4); fen=read_ds(2); miao=read_ds(0); write_sfm(10,miao);//送液晶显示 write_sfm(7,fen); write_sfm(4,shi); write_week(week); write_nyr(3,year); write_nyr(6,month); write_nyr(9,day); } } } void exter() interrupt 2//外部中断1服务程序 { uchar c; //进入中断表示闹钟时间到， flag_ri=1; //设置标志位，用以大程序中报警提示 c=read_ds(0x0c);//读取12C887的C寄存器表示响应了中断 } 
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看不出什么问题，把变量名放两行写试试呢。
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