基于单片机的电子日历时钟系统

目录一、设计任务二、设计方案三、硬件及电路设计四、程序设计及流程图五、设计体会一、设计任务利用单片机及外围接口电路（键盘接口和显示接口电路）设计制作一个电子日历时钟系统。

使用液晶显示器将日期，时间实时显示出来，并且能够通过按钮修改日期，完成实时操作并具有闹铃功能。

二、设计方案硬件选择:单片机AT89C51,DS1302时钟芯片,SED1520液晶控制器接口芯片：74LS138,74LS373,片选CS0三、硬件及电路设计（一）实验所用芯片简要介绍1、主控芯片采用单片机AT89C51AT89C51是一种带4K字节FLASH存储器（FPEROM—Flash Programmable and Erasable Read Only Memory）的低电压、高性能CMOS 8位微处理器，俗称单片机，与AT80C51引脚和指令系统完全兼容，可擦除只读存储器可以反复擦除1000次。

AT89C51共有128×8位内部RAM ，32可编程I/O线，两个16位定时器/计数器，5个中断源，采用全静态工作，三级程序存储器锁定和可编程串行通道，工作频率为0Hz-24MHz。

另外片内内置振荡器和时钟电路，低功耗的闲置和掉电模式。

2、实时时钟部分采用DS1302DS1302 是美国DALLAS公司推出的一种高性能、低功耗、带RAM 的实时时钟电路，它可以对年、月、日、周日、时、分、秒进行计时，具有闰年补偿功能，工作电压为 2.5V～5.5V。

采用三线接口与CPU 进行同步通信，并可采用突发方式一次传送多个字节的时钟信号或RAM数据。

DS1302内部有一个31×8的用于临时性存放数据的RAM寄存器。

DS1302是DS1202的升级产品，与DS1202兼容，但增加了主电源/后备电源双电源引脚，同时提供了对后备电源进行涓细电流充电的能力。

3、SED1520液晶控制器SED1520液晶显示驱动器是一种点阵图形式液晶显示驱动器，它可直接与8位微处理器相连，集行、列驱动器于一体，因此使用起来十分方便，作为内藏式控制器被广泛应用于点阵数较少的液晶显示模块，内置显示RAM区RAM容量为2560位，RAM中的1位数据控制液晶屏上一个点的亮灭状态：“1”表示亮，“0”表示暗，具有16个行驱动口和16个列驱动口，可直接与80系列微处理器相连，亦可直接与68系列微处理器相连。

驱动占空比为1／16或1／32。

可以与SED1520配合使用，以便扩展列驱动口数目。

（二）硬件设计（三）电路图四、程序设计实验执行程序如下：#include <reg51.h>#define uchar unsigned charY 132.76...#define uint unsigned int#define PD1 61unsigned char aa,bb,cc,s1num;unsigned char curtime[];void WriteSHU16x16(unsigned char,unsigned char,unsigned char);void WriteZHI16x16(unsigned char,unsigned char,unsigned char);void Delay(unsigned char);sbit t_clk=P1^0;sbit t_io=P1^1;sbit t_rst=P1^2;sbit s1=P1^5;sbit s2=P1^6;sbit s3=P1^7;sbit sv=reset;unsigned int i;unsigned char Column;unsigned char Page_ ;unsigned char Code_ ;unsigned char Column1;unsigned char Page;unsigned char Code1 ;unsigned char Command;unsigned char LCDData;xdata unsigned char CWADD1 _at_ 0x8000; xdata unsigned char DWADD1 _at_ 0x8001; xdata unsigned char CRADD1 _at_ 0x8002; xdata unsigned char DRADD1 _at_ 0x8003; xdata unsigned char CWADD2 _at_ 0x8004; xdata unsigned char DWADD2 _at_ 0x8005; xdata unsigned char CRADD2 _at_ 0x8006; xdata unsigned char DRADD2 _at_ 0x8007; code unsigned char SHUTAB[][16]={{0x3E,0x51,0x49,0x45,0x3E}, // -0- {0x00,0x42,0x7F,0x40,0x00}, // -1-{0x62,0x51,0x49,0x49,0x46}, // -2-{0x21,0x41,0x49,0x4D,0x33}, // -3-{0x18,0x14,0x12,0x7F,0x10}, // -4-{0x27,0x45,0x45,0x45,0x39}, // -5-{0x3C,0x4A,0x49,0x49,0x31}, // -6-{0x01,0x71,0x09,0x05,0x03}, // -7-{0x36,0x49,0x49,0x49,0x36}, // -8-{0x46,0x49,0x49,0x29,0x1E}, // -9-{0x00,0x08,0x08,0x08,0x00},// --- };code unsigned char CCTAB[][32] ={{0x00,0x20,0x10,0xCC,0x47,0x44,0x44,0xFC,0x44,0x44,0x44,0x64,0x46,0x04,0x00,0x00,0x04,0x04,0x04,0x07,0x04,0x04,0x04,0xFF,0x04,0x04,0x04,0x04,0x04,0x06,0x04,0x00},{0x00,0x00,0x00,0x00,0xFE,0x22,0x22,0x22,0x22,0x22,0x22,0xFF,0x02,0x00,0x00,0x00,0x00,0x80,0x40,0x30,0x0F,0x02,0x02,0x02,0x02,0x42,0x82,0x7F,0x00,0x00,0x00,0x00},{0x00,0x00,0x00,0xFE,0x82,0x82,0x82,0x82,0x82,0x82,0x82,0xFF,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x7F,0x00,0x00,0x00,0x00} };void wr_1302(unsigned char add,unsigned char date) { uchar i;t_rst=0;t_clk=0;t_rst=1;for(i=0;i<8;i++) { if(add&0x01)t_io=1;elset_io=0;t_clk=1;t_clk=0;add>>=1;}for(i=0;i<8;i++) { if(date&0x01)t_io=1;elset_io=0;t_clk=1;t_clk=0;date>>=1;}t_rst=0;}unsigned char re_1302(unsigned char add) { uchar date,i;t_rst=0;t_clk=0;t_rst=1;for(i=0;i<8;i++){ if(add&0x01)t_io=1;elset_io=0;t_clk=1;t_clk=0;add>>=1;}for(i=0;i<8;i++){ date>>=1;if(t_io)date=date|0x80;t_clk=1;t_clk=0;}t_rst=0;return(date);}void set_1302(){ wr_1302(0x8e,0x00);wr_1302(0x8c,curtime[6]);wr_1302(0x8a,curtime[5]);wr_1302(0x88,curtime[4]);wr_1302(0x86,curtime[3]);wr_1302(0x84,curtime[2]);wr_1302(0x82,curtime[1]);wr_1302(0x80,curtime[0]);wr_1302(0x8e,0x80);}void get_1302(){ cc=re_1302(0x81);aa=cc>>4;bb=cc&0x0f;WriteSHU16x16(0x04,0x30,aa);Delay(5);WriteSHU16x16(0x04,0x38,bb);curtime[0]=aa*10+bb;cc=re_1302(0x83);aa=cc>>4;bb=cc&0x0f;WriteSHU16x16(0x04,0x18,aa);Delay(5);WriteSHU16x16(0x04,0x20,bb);curtime[1]=aa*10+bb;cc=re_1302(0x85);aa=cc>>4;bb=cc&0x0f;WriteSHU16x16(0x04,0x00,aa);Delay(5);WriteSHU16x16(0x04,0x08,bb); curtime[2]=aa*10+bb;cc=re_1302(0x87);aa=cc>>4;bb=cc&0x0f;WriteSHU16x16(0x02,0x40,aa); Delay(5);WriteSHU16x16(0x02,0x48,bb); curtime[3]=aa*10+bb;cc=re_1302(0x89);aa=cc>>4;bb=cc&0x0f;WriteSHU16x16(0x02,0x20,aa); Delay(5);WriteSHU16x16(0x02,0x28,bb); curtime[4]=aa*10+bb;cc=re_1302(0x8d);aa=cc>>4;bb=cc&0x0f;WriteSHU16x16(0x02,0x00,aa);Delay(5);WriteSHU16x16(0x02,0x08,bb);curtime[6]=aa*10+bb;WriteSHU16x16(0x04,0x10,10);WriteSHU16x16(0x04,0x28,10);WriteZHI16x16(0x02,0x10,0);WriteZHI16x16(0x02,0x30,1);WriteZHI16x16(0x02,0x50,2);}void WriteCommandE1(unsigned char Command) {while(CRADD1 & 0x80);CWADD1 = Command;}void WriteDataE1(unsigned char LCDData){ while(CRADD1 & 0x80);DWADD1 = LCDData;}void ReadDataE1(unsigned char DRADD1){ while(CRADD1 & 0x80);LCDData = DRADD1;}void WriteCommandE2(unsigned char Command) { while(CRADD2 & 0x80);CWADD2 = Command;}void WriteDataE2(unsigned char LCDData){ while(CRADD2 & 0x80);DWADD2 = LCDData;}void ReadDataE2(unsigned char DRADD2){ while(CRADD2 & 0x80);LCDData = DRADD2;}void Init(){ WriteCommandE1(0xe2); WriteCommandE2(0xe2); WriteCommandE1(0xa4);WriteCommandE2(0xa4); WriteCommandE1(0xa9); WriteCommandE2(0xa9); WriteCommandE1(0xa0); WriteCommandE2(0xa0); WriteCommandE1(0xc0); WriteCommandE2(0xc0); WriteCommandE1(0xaf); WriteCommandE2(0xaf);}void Clear(){ unsigned char i,j;for(i=0;i<4;i++){ WriteCommandE1(i+0xb8);WriteCommandE2(i+0xb8);WriteCommandE1(0x00);WriteCommandE2(0x00);for(j=0;j<61;j++){ WriteDataE1(0x00);WriteDataE2(0x00);}}}void Delay(unsigned int z){unsigned int x,y;for(x=z;x>0;x--)for(y=110;y>0;y--);}void WriteSHU16x16(unsigned char Page_,unsigned char Column,unsigned char Code_){ unsigned int i,j,k;i = 0;j = 0;while(j<2){ WriteCommandE1(((Page_ + j) & 0x03) | 0xb8);WriteCommandE2(((Page_ + j) & 0x03) | 0xb8);k = Column;while(k<Column + 8){ if (k < PD1){ WriteCommandE1(k);LCDData = SHUTAB[Code_][i];WriteDataE1(LCDData);}else{ Command = k-PD1;WriteCommandE2(Command);LCDData = SHUTAB[Code_][i];WriteDataE2(LCDData);};i++;if( ++k >= PD1 * 2) break;} ;j++;};}void WriteZHI16x16(unsigned char Page,unsigned char Column1,unsigned char Code1){ unsigned int i,j,k;i = 0;j = 0;while(j<2){ WriteCommandE1(((Page + j) & 0x03) | 0xb8);WriteCommandE2(((Page + j) & 0x03) | 0xb8);k = Column1;while(k<Column1 + 16){ if (k < PD1){ WriteCommandE1(k);LCDData = CCTAB[Code1][i];WriteDataE1(LCDData);}else{ Command = k-PD1;WriteCommandE2(Command);LCDData = CCTAB[Code1][i];WriteDataE2(LCDData);};i++;if( ++k >= PD1 * 2) break;} ;j++;};}void keyscan(){s1num = 0;sv=0;if(s1==0){ Delay(5);if(s1==0){ s1num++;while(!s1);}}if(s1num!=0){ if(s1num==1){if(s2==0){Delay(5);if(s2==0){ if(curtime[0]==59){curtime[0]=0;}else curtime[0]++;}}if(s3==0){Delay(5);if(s3==0){ if(curtime[0]==0){curtime[0]=59;}else curtime[0]--;}}}if(s1num==2){ if(s2==0){Delay(5);if(s2==0){ if(curtime[1]==59){curtime[1]=0;}else curtime[1]++;}}if(s3==0){Delay(5);if(s3==0){ if(curtime[1]==0){curtime[1]=59;}else curtime[1]--;}}}if(s1num==3){ if(s2==0){Delay(5);if(s2==0){ if(curtime[2]==23){curtime[2]=0;}else curtime[2]++;}}if(s3==0){Delay(5);if(s3==0){ if(curtime[2]==0){curtime[2]=23;}else curtime[2]--;}}}if(s1num==4){ if(s2==0){Delay(5);if(s2==0){ if(curtime[3]==31){curtime[3]=1;}else curtime[3]++;}}if(s3==0){Delay(5);if(s3==0){ if(curtime[3]==1){curtime[3]=31;}else curtime[3]--;}}}if(s1num==5){ if(s2==0){Delay(5);if(s2==0){ if(curtime[4]==12){curtime[4]=1;}else curtime[4]++;}}if(s3==0){Delay(5);if(s3==0){ if(curtime[4]==1){curtime[4]=12;}else curtime[4]--;}}}if(s1num==6){ if(s2==0){Delay(5);if(s2==0){ if(curtime[6]==99){curtime[6]=0;}else curtime[6]++;}}if(s3==0){Delay(5);if(s3==0){ if(curtime[6]==0){curtime[6]=99;}else curtime[6]--;}}}if(s1num==7){s1num=0;}set_1302();get_1302();}}void main(){ Init();Clear();set_1302();while(1){keyscan();get_1302();}}.。