1、基于51單片機(jī)的帶報(bào)警的電子表 1 實(shí)驗(yàn)任務(wù) 利用單片機(jī)AT89C51與1602設(shè)計(jì)一個(gè)電子表，當(dāng)滿60秒時(shí)候溢出，喇叭響一次。 2 電路原理圖 3 系統(tǒng)板上硬件連線 1）.P0口與1602的數(shù)據(jù)輸入輸出口相連；2）.使能端相連，ES,RW,EN分別與P2.0,P2.1,P2.2相連；3）.蜂鳴器與P3.7相連；4）.上圖12864也可以實(shí)現(xiàn)（程序未列）；4.c語(yǔ)言程序設(shè)計(jì)#include#define uchar unsigned char#define uint unsigned intsbit rs=P20; /1602設(shè)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);/函數(shù)聲明 void DelayMs(unsigned char t);void Del

3、ayUs2x(unsigned char t) while(-t);/*- mS延時(shí)函數(shù)，含有輸入?yún)?shù) unsigned char t，無(wú)返回值 unsigned char 是定義無(wú)符號(hào)字符變量，其值的范圍是 0255 這里使用晶振12M，精確延時(shí)請(qǐng)使用匯編-*/void DelayMs(unsigned char t) while(t-) /大致延時(shí)1mS DelayUs2x(245); DelayUs2x(245); void delay(uint z)/延時(shí) 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、寫命令 rs=0; rw=0; P0=cmd; lcde=0; delay(1); lcde=1; delay(1); lcde=0; delay(1);void write_date(uchar date)/1602寫數(shù)據(jù) 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顯示 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