Digital clock production of 89C52 single chip microcomputer-EEWORLD

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This is similar to the digital stopwatch in the previous article, except that it has four seven-segment displays, and the entire display is divided into three parts: hours, minutes, and seconds. When the hour is 24, it is set to 0, when the minutes are 60, it is set to 0 and incremented by 1, and when the seconds are 60, it is set to 0 and incremented by 1.

program:

#include

void delay(unsigned char dly)

{

unsigned char i,j;

for(i=100;i>0;i--)

for(j=dly;j>0;j--)

;

}

unsigned char num,time1,time2,time3;

void timer0()interrupt 1

{

TH0=(65535-46080)/256;

TL0=(65535-46080)% 256;

num++;

if(num==20)

{

num=0;

time1++;

}

void intial()

{

TMOD=0x01;

ET0=1;

EA=1;

TR0=1;

num=0;

time1=0;

time2=0;

time3=0;

}

void main()

{

unsigned char table[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};

unsigned char shi,fen;

intial();

while(1)

{

if(time1==60)

{

time1=0;

time2++;

}

if(time2==60)

{

time2=0;

time3++;

}

if(time3==24)

time3=0;

shi=time1/10;

fen=time1% 10;

P2=0xf7;

P0=table[shi];

delay(2);

P2=0xfb;

P0=table[fen];

delay(2);

shi=time2/10;

fen=time2% 10;

P2=0xdf;

P0=table[shi];

delay(2);

P2=0xef;

P0=table[fen];

delay(2);

shi=time3/10;

fen=time3% 10;

P2=0x7f;

P0=table[shi];

delay(2);

P2=0xbf;

P0=table[fen];

delay(2);

}

Keywords：89C52 Reference address：Digital clock production of 89C52 single chip microcomputer

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