电子万年历毕业设计(基于AT89C51单片机和DS1302时钟芯片)

{

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

if(shi==-1) { }

shi=23;

ds1302_write(0x84,((shi/10)<<4)+((shi)&0x0f));

}

else if(mod==2) {

fen=(((fen>>4)&0x07)*10+(fen&0x0f))-1;

if(fen==-1) {

fen=59;

}

ds1302_write(0x82,((fen/10)<<4)+((fen)&

0x0f));

else if(mod==3) {

nian=(((nian>>4)&0x0f)*10+(nian&0x0f))-1; if(nian==0)

{ }

nian=99;

}

ds1302_write(0x8c,((nian/10)<<4)+((nian

)&0x0f)); }

else if(mod==4) {

yue=(((yue>>4)&0x01)*10+(yue&0x0f))-1; if(yue==0)

{ }

yue=12;

ds1302_write(0x88,((yue/10)<<4)+((yue)&

0x0f));//yue }

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==0)

{ ri=31;}

}

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

ri=(((ri>>4)&0x03)*10+(ri&0x0f))-1; if(ri==0) { ri=30; }