数字显示00~59按钮1每次按下显示器值加一，按钮2每次按下显示器值减一，按钮3功能零，按钮4启动或停止计时器0

#include<reg52.h>

#define uchar unsigned char 

#define uint unsigned int 

sbit key1=P3^4;

sbit key2=P3^5;

sbit key3=P3^6;

sbit key4=P3^7;

sbit dula=P2^6;

sbit wela=P2^7;

uchar code table[]={

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

void delayms(uint);

uchar numt0,num;

void display(uchar numdis)

{

uchar shi,ge;

shi=numdis/10;

ge=numdis%10;

dula=1;

P0=table[shi];

dula=0;

P0=0xff;

wela=1;

P0=0xfe;

wela=0;

delayms(5);

dula=1;

P0=table[ge];

dula=0;

P0=0xff;

wela=1;

P0=0xfd;

wela=0;

delayms(5);

}

void delayms(uint xms)

{

uint i,j;

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

for(j=110;j>0;j--);

}

void init()

{

TMOD=0x01;

TH0=(65535-45872)/256;

TL0=(65536-45872)%256;

EA=1;

ET0=1;

}

void keyscan()

{

if(key1==0)

{

delayms(10);

if(key1==0)

{

num++;

if(num==60)

num=0;

while(!key1);

}

}

if(key2==0)

{

delayms(10);

if(key2==0)

{

if(num==0)

num=60;

num--;

while(!key2);

}

}

if(key3==0)

{

delayms(10);

if(key3==0)

{

num=0;

while(!key3);

}

}

if(key4==0)

{

delayms(10);

if(key4==0)

{

while(!key4);

TR0=~TR0;

}

}

}

void main()

{

init();

while(1)

{

keyscan();

display(num);

}

}

void T0_timer() interrupt 1

{

TH0=(65536-45872)/256;

//重装初值

TL0=(65536-45872)%256;

numt0++;

if(numt0==20)

{

numt0=0;

num++;

if(num==60)

num=0;

}

}

版权声明：本文博主原创文章。博客，未经同意不得转载。