下面是仿真原理图:
51单片机驱动DS12887时钟芯片,采用lcd1602液晶屏来显示万年历
源程序如下:
#include
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;
sbit wela=P2^7;
sbit rs=P3^5;
sbit lcden=P3^4;
sbit s1=P3^0;
sbit s2=P3^1;
sbit s3=P3^2;
sbit rd=P3^7;
sbit s4=P3^3;
sbit dsds=P1^7;
sbit dsrw=P1^6;
sbit dsas=P1^5;
sbit dscs=P1^4;
sbit dsirq=P3^3;
uchar count,shi,fen,miao,s1num,week=0,i,day=1,yue=1,year1=0,year2,year3,year4;
uchar code table1[]=" 0000-01-01 MON"; //初始显示
uchar code table2[]=" 00:00:00";
uchar code table3[7][3]={"MON","TUE","WED","THU","FRI","STA","SUN"};//星期的编码
//*****延时函数
void delay(uchar z)
{
uchar x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
//****写命令函数
void write_com(uchar com)
{
rs=0;
lcden=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
//****写入数据函数
void write_data(uchar date)
{
rs=1;
lcden=0;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
//****初始化函数
void init()
{
uchar num;
// year=year1+year2*10+year3*100+year4*1000;
wela=0;
dula=0;
lcden=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
write_com(0x80);
for(num=0;num<15;num++)
{
write_data(table1[num]);
delay(20);
}
write_com(0x80+0x40);
for(num=0;num<12;num++)
{
write_data(table2[num]);
delay(20);
}
/* TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1; */
}
//*****显示时分秒
void write_sfm(uchar add,uchar date1)
{
uchar shi,ge;
shi=date1/10;
ge=date1%10;
write_com(add+0x80+0x40);
write_data(0x30+shi);
write_data(0x30+ge);
}
//*****显示年月日
void write_sfm1(uchar add,uchar date1)
{
uchar shi,ge;
shi=date1/10;
ge=date1%10;
write_com(add+0x80);
write_data(0x30+shi);
write_data(0x30+ge);
}
void key2();
void key3();
//******键盘扫描函数
void keyscan()
{
rd=0;
if(s1==0)//第一个键被按下
{
delay(5); //************去除抖动
if(s1==0)
{
s1num++; //***第一个键没被按下一次,s1num就加1
while(!s1);
if(s1num==1) //当被按下一次时,光标停在秒位上并开始闪烁,始终停止
{
TR0=0;
write_com(0x80+0x40+11);
write_com(0x0f);
}
if(s1num==2) //被按下第二次,光标停在分位上
{
write_com(0x80+0x40+8);
}
if(s1num==3) //被按下第三次,光标停在时位上
{
write_com(0x80+0x40+5);
}
if(s1num==4) //被按下第四次,光标停在显示星期的位上
{
write_com(0x80+15);
}
if(s1num==5) //被按下第五次,光标停在显示日子的位上
{
write_com(0x80+10);
}
if(s1num==6) //被按下第六次,光标停在显示月的位上
{
write_com(0x80+7);
}
if(s1num==7) //被按下第七次,光标停在显示年的个位上
{
write_com(0x80+4);
}
if(s1num==8) //被按下第八次,光标停在十位上
{
write_com(0x80+3);
}
if(s1num==9) //被按下第九次,光标停在百位上
{
write_com(0x80+2);
}
if(s1num==10) //被按下第十次,光标停在千位上
{
write_com(0x80+1);
}
if(s1num==11) //被按下第十一次,时钟从设置的时刻开始
{
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