文檔017、99秒馬表設(shè)計(jì)

17．99秒馬表設(shè)計(jì)1．實(shí)驗(yàn)任務(wù)

（1．開始時(shí)，顯示“00”，第1次按下SP1后就開始計(jì)時(shí)。

（2．第2次按SP1后，計(jì)時(shí)停止。

（3．第3次按SP1后，計(jì)時(shí)歸零。2．電路原理圖

圖4.17.13．系統(tǒng)板上硬件連線（1．把“單片機(jī)系統(tǒng)”區(qū)域中的P0.0/AD0－P0.7/AD7端口用8芯排線連接到“四路靜態(tài)數(shù)碼顯示模塊”區(qū)域中的任一個(gè)a－h(huán)端口上；要求：P0.0/AD0對(duì)應(yīng)著a，P0.1/AD1對(duì)應(yīng)著b，……，P0.7/AD7對(duì)應(yīng)著h。（2．把“單片機(jī)系統(tǒng)”區(qū)域中的P2.0/A8－P2.7/A15端口用8芯排線連接到“四路靜態(tài)數(shù)碼顯示模塊”區(qū)域中的任一個(gè)a－h(huán)端口上；要求：P2.0/A8對(duì)應(yīng)著a，P2.1/A9對(duì)應(yīng)著b，……，P2.7/A15對(duì)應(yīng)著h。（3．把“單片機(jī)系統(tǒng)“區(qū)域中的P3.5/T1用導(dǎo)線連接到”獨(dú)立式鍵盤“區(qū)域中的SP1端口上；4．程序框圖

主程序框圖T0中斷服務(wù)程序框圖MOVCA,@A+DPTR

MOVP2,A

MOVTMOD,#02H

SETBET0

SETBEA

WT:JBSP1,WT

LCALLDELY10MS

JBSP1,WT

INCKEYCNT

MOVA,KEYCNT

CJNEA,#01H,KN1

SETBTR0

MOVTH0,#06H

MOVTL0,#06H

MOVTCNTA,#00H

MOVTCNTB,#00H

LJMPDKN

KN1:CJNEA,#02H,KN2

CLRTR0

LJMPDKN

KN2:CJNEA,#03H,DKN

MOVSEC,#00H

MOVA,SEC

MOVB,#10

DIVAB

MOVDPTR,#TABLE

MOVCA,@A+DPTR

MOVP0,A

MOVA,B

MOVDPTR,#TABLE

MOVCA,@A+DPTR

MOVP2,A

MOVKEYCNT,#00H

DKN:JNBSP1,$

LJMPWT

DELY10MS:

MOVR6,#20

D1:MOVR7,#248

DJNZR7,$

DJNZR6,D1

RET

INT_T0:

INCTCNTA

MOVA,TCNTA

CJNEA,#100,NEXT

MOVTCNTA,#00H

INCTCNTB

MOVA,TCNTB

CJNEA,#4,NEXT

MOVTCNTB,#00H

INCSEC

MOVA,SEC

CJNEA,#100,DONE

MOVSEC,#00H

DONE:MOVA,SEC

MOVB,#10

DIVAB

MOVDPTR,#TABLE

MOVCA,@A+DPTR

MOVP0,A

MOVA,B

MOVDPTR,#TABLE

MOVCA,@A+DPTR

MOVP2,A

NEXT:RETI

TABLE:DB3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH

END

6．C語言源程序

#include<AT89X51.H>

unsignedcharcodedispcode[]={0x3f,0x06,0x5b,0x4f,

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

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

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

unsignedcharsecond;

unsignedcharkeycnt;

unsignedinttcnt;

voidmain(void)

{

unsignedchari,j;

TMOD=0x02;

ET0=1;

EA=1;

second=0;

P0=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)

{

case1:

TH0=0x06;

TL0=0x06;

TR0=1;

break;

case2:

TR0=0;

break;

case3:

keycnt=0;

second=0;

P0=dispcode[second/10];

P2=dispcode[second%10];

break;

}

while(P3_5==0);

}

}

}

}

voidt0(void)interrupt1using0

{

tcnt++;

if(tcnt==400)