利用Proteus仿真软件设计一个具有按键清零功能的计时00-59的两位秒表时间的显示电路。利用两位LED数码管

#include <reg51.H>

sbit P3_5 =P3^5;

unsigned char code dispcode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,

0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0x00};

unsigned char second;

unsigned char keycnt;

unsigned int tcnt;

void main(void)

{

unsigned char i,j;

TMOD=0x02;

ET0=1;

EA=1;

second=0;

P1=dispcode[second/10];

P2=dispcode[second%10];

while(1)

{

if(P3_5==0)

{

for(i=20;i>0;i--)

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

if(P3_5==0)

{

keycnt++;

switch(keycnt)

{

case 1:

TH0=0x06;

TL0=0x06;

TR0=1;

break;

case 2:

TR0=0;

break;

case 3:

keycnt=0;

second=0;

P1=dispcode[second/10];

P2=dispcode[second%10];

break;

}

while(P3_5==0);

}

}

}

}

void t0(void) interrupt 1 using 0

{

tcnt++;

if(tcnt==4000)

{

tcnt=0;

second++;

if(second==100)

{

second=0;

}

P1=dispcode[second/10];

P2=dispcode[second%10];

}

}