带报警的电子表

1、基于51单片机的带报警的电子表 1 实验任务 利用单片机AT89C51与1602设计一个电子表，当满60秒时候溢出，喇叭响一次。 2 电路原理图 3 系统板上硬件连线 1）.P0口与1602的数据输入输出口相连；2）.使能端相连，ES,RW,EN分别与P2.0,P2.1,P2.2相连；3）.蜂鸣器与P3.7相连；4）.上图12864也可以实现（程序未列）；4.c语言程序设计#include#define uchar unsigned char#define uint unsigned intsbit rs=P20; /1602设置sbit lcde=P22;sbit rw=P21;sbit b

2、eep=P37;uchar code table=2012-10-26;uchar code table1=00-00-00;uchar num,t,num1;uchar sec,min,hour,g,s;void init();void write_cmd(uchar cmd);void write_date(uchar date);void display(uchar add,uchar date); unsigned char frq; void DelayUs2x(unsigned char t);/函数声明 void DelayMs(unsigned char t);void Del

3、ayUs2x(unsigned char t) while(-t);/*- mS延时函数，含有输入参数 unsigned char t，无返回值 unsigned char 是定义无符号字符变量，其值的范围是 0255 这里使用晶振12M，精确延时请使用汇编-*/void DelayMs(unsigned char t) while(t-) /大致延时1mS DelayUs2x(245); DelayUs2x(245); void delay(uint z)/延时 uint x,y; for(x=115;x0;x-) for(y=z;y0;y-);void init()/初始化 write_c

4、md(0x38); write_cmd(0x0C); write_cmd(0x06); write_cmd(0x80+3); for(num=0;num10;num+) write_date(tablenum); delay(1); write_cmd(0x80+0x40+4);for(num=0;num8;num+) write_date(table1num); delay(1); TMOD=0x01; TH0=(65536-46080)/256; TL0=(65536-46080)%256; EA=1; ET0=1; TR0=1;void write_cmd(uchar cmd)/1602

5、写命令 rs=0; rw=0; P0=cmd; lcde=0; delay(1); lcde=1; delay(1); lcde=0; delay(1);void write_date(uchar date)/1602写数据 rs=1; rw=0; P0=date; lcde=0; delay(1); lcde=1; delay(1);lcde=0; delay(1);void display(uchar add,uchar date)/1602显示 g=date%10; s=date/10; write_cmd(0x80+0x40+add); write_date(0x30+s); write_date(0x30+g); void main() uint i; init(); while(1) if(t=20) t=0; sec+; if(sec=60) sec=0; min+; for(i=0;i500;i+) DelayMs(1); beep=!beep; if(min=60) min=0; hour+; if(hour=24) hour=0; display(4,hour); display(7,min); di