C51简单电子钟 -

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本文引用地址: http://www.21ic.com/app/mcu/201808/785362.htm

Seven Segment LED Clock

COPYRIGHT (c) 2012 DESIGNED BY GARRY

-- ALL RIGHTS RESERVED --

File Name: Seven Segment LED Clock.c

Author: GARRY MENG

Created: 2012-08-18 20:17:34

Modified:

Revision: 1.0

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#include

#define uchar unsigned char

#define uint unsigned int

uint counter=0;

uchar second=58;

uchar minute=33;

uchar hour=22;

uchar bitselect=1;

uchar temp=0;

uchar getBCD(uchar i)

{

switch(i)

{

case 0:i=0xc0;break;

case 1:i=0xf9;break;

case 2:i=0xa4;break;

case 3:i=0xb0;break;

case 4:i=0x99;break;

case 5:i=0x92;break;

case 6:i=0x82;break;

case 7:i=0xf8;break;

case 8:i=0x80;break;

case 9:i=0x90;break;

default:i=0xff;

}

return i;

}

void timer2()interrupt 5 using 1

{

uchar t;

TF2=0;

counter++;

if(counter==400)

{

second++;

counter=0;

if(second==60)

{

second=0;

minute++;

if(minute==60)

{

minute=0;

hour++;

if(hour==24)

{

hour=0;

}

}

}

}

switch(bitselect)

{

case 1: t=second%10;break;

case 2: t=second/10;break;

case 4: t=minute%10;break;

case 8: t=minute/10;break;

case 16:t=hour%10; break;

case 32:t=hour/10; break;

}

P1=0xff; //这一句不加Proteus仿真时数码管不亮，可能是驱动能力不足吧。实际电路是亮的，

P0=~bitselect; //但是会有上一位显示的余辉，这一句看来必须要加了。

P1=getBCD(t);

bitselect<<=1;

if(bitselect==64)

bitselect=1;

}

void timer0()interrupt 1 using 2

{

uchar keyvalue;

TL0|=0X00;

TH0=0XDC;

keyvalue=P2;

temp++;

keyvalue&=0x0f;

if(temp==1||temp==17)

{

switch(keyvalue)

{

case 0x0E:

second++;

if(second==60)

{

second=0;

minute+=1;

}

break;

case 0x0D:

minute++;

if(minute==60)

{

minute=0;

hour++;

}

break;

case 0x0B:

hour++;

if(hour==24)

hour=0;

break;

}

}

if(temp==17)

temp=2;

if(keyvalue==0x0f)

{

TR0=0;

temp=0;

}

}

main()

{

uchar key;

TH2=0Xf7;

TL2=0X00;

RCAP2H=0Xf7;

RCAP2L=0X00;

RCLK=0;

TCLK=0;

CP_RL2=0;

TMOD=0X01;

TR2=1;

PT2=1; //T2为最高级中断

EA=1; //t0 t2中断打开

ET0=1;

ET2=1;

while(1)

{

key=P2;

if(key!=0xff)

if(!TR0)

{

TH0=0XDC;

TL0=0X00;

TR0=1;

}

}

}