电子万年历毕业设计（基于AT89C51单片机和DS1302时钟芯片）

else if(mod==5) {

if((yue==1)||(yue==3)||(yue==5)||(yue==7)||(yue==8)||(yue==10)||(yue==12)) {

ri=(((ri>>4)&0x03)*10+(ri&0x0f))+1;

if(ri>=32) {

ri=1;

}

}

if((yue==4)||(yue==6)||(yue==9)||(yue==11)) {

ri=(((ri>>4)&0x03)*10+(ri&0x0f))+1;

if(ri>=31) { ri=1; } }

if(yue==2) {

ri=(((ri>>4)&0x03)*10+(ri&0x0f))+1; if(ri>=29) { ri=1; } }

ds1302_write(0x86,((ri/10)<<4)+((ri)&0x

0f));

}

else if(mod==6) {

baojingshi=(((baojingshi>>4)&0x01)*10+(baojingshi&0x0f))+1;

if(baojingshi==24) { }

baojingshi=0;

ds1302_write(0x88,((baojingshi/10)<<4)+((b

aojingshi)&0x0f)); }

else if(mod==7) {

baojingfen=(((baojingfen>>4)&0x01)*10+(baojingfen&0x0f))+1;

if(baojingfen==60) {

}

baojingfen=0;

ds1302_write(0x88,((baojingfen/10)<<4)+((b

aojingfen)&0x0f)); }

}

}

if(sub==0) {

delay(5); {

if(sub==0) {

while(sub==0); if(mod==1)