7． C語言源程序

#include AT89X51.H>

unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,

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

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

0x39,0x5e,0x79,0x71,0x00};

unsigned char dispbitcode[]={0xfe,0xfd,0xfb,0xf7,

0xef,0xdf,0xbf,0x7f};

unsigned char dispbuf[8]={0,0,16,0,0,16,0,0};

unsigned char dispbitcnt;

unsigned char second;

unsigned char minite;

unsigned char hour;

unsigned int tcnt;

unsigned char mstcnt;

unsigned char i,j;

void main(void)

{

TMOD=0x02;

TH0=0x06;

TL0=0x06;

TR0=1;

ET0=1;

EA=1;

while(1)

{

if(P0_0==0)

{

for(i=5;i>0;i--)

for(j=248;j>0;j--);

if(P0_0==0)

{

second++;

if(second==60)

{

second=0;

}

dispbuf[0]=second;

dispbuf[1]=second/10;

while(P0_0==0);

}

}

if(P0_1==0)

{

for(i=5;i>0;i--)

for(j=248;j>0;j--);

if(P0_1==0)

{

minite++;

if(minite==60)

{

minite=0;

}

dispbuf[3]=minite;

dispbuf[4]=minite/10;

while(P0_1==0);

}

}

if(P0_2==0)

{

for(i=5;i>0;i--)

for(j=248;j>0;j--);

if(P0_2==0)

{

hour++;

if(hour==24)

{

hour=0;

}

dispbuf[6]=hour;

dispbuf[7]=hour/10;

while(P0_2==0);

}

}

}

}

void t0(void) interrupt 1 using 0

{

mstcnt++;

if(mstcnt==8)

{

mstcnt=0;

P1=dispcode[dispbuf[dispbitcnt]];

P3=dispbitcode[dispbitcnt];

dispbitcnt++;

if(dispbitcnt==8)

{

dispbitcnt=0;

}

}

tcnt++;

if(tcnt==4000)

{

tcnt=0;

second++;

if(second==60)

{

second=0;

minite++;

if(minite==60)

{

minite=0;

hour++;

if(hour==24)

{

hour=0;

}

}

}

dispbuf[0]=second;

dispbuf[1]=second/10;

dispbuf[3]=minite;

dispbuf[4]=minite/10;

dispbuf[6]=hour;

dispbuf[7]=hour/10;

}

}