基于AT89C51单片机的最小系统设计

基于AT89C5 仲片机的最小系统设计组员：田竹、王维、袁倍明摘要：AT89C51单片机的最小系统。用P1灯，用P2口和P0口分别作段选和位选设计了六位数码管的静动态显示和简易的电子钟，用P34*462256扩展内部RAMLCD1602和DAC0832分别实现了A/D、D/A转换功能。一、系统电源用MC7805+5V稳压给系统供电二、晶振（12MHZ）及复位电路采用12MHz的外部晶振，给系统提供时钟信号。并采用了按键复位电路。、流水灯8个led灯循环闪烁源程序:流水灯 1° 2

D21 16D3 1 T3 ■EKSK"

PIOPllP12*5V| ---------11亠 门7r S

--------

EHZFHk.1

P13P14P15P16LJMPLOOP

Res36OR

LEDODLY:MOVR7,#250;延时子程序DLY1:MOVR6,#200DJNZR6,$DJNZR7,DLY1RETEND四、数码管9功能描 数码管动态显示 1~69窝 213rn且rn且

寸 日

Q26LEDCMgq o p J 3 pgoz「Loz「Loo源程序：ORG0000HLJMPSTARTORG0100HSTART:oo

1d —

-1 二 oMOVP0,#0MOVSETBP0.0LCALLDELAYCLRMOVP2,#0C4HSETBP0.1LCALLCLRP0.1MOVSETBP0.2LCALLDELAYCLRP0.2MOVP2,#99HSETBP0.3LCALLDELAYCLRP0.3MOVP2,#92HSETBP0.4LCALLDELAYCLRP0.4MOVP2,#82HSETBP0.5LCALLDELAYCLRP0.5LJMPSTARTDELAY:MOVD1:MOVR6,#20D2:MOVR7,#248DJNZR7,$DJNZDJNZRETEND五、4*4矩阵键盘和蜂鸣器功能描述：通过按键让数码管显示0-F，按键按下时，蜂鸣器响一下LSIP2_Speaker—GND源程序：ORG0000HLJMPMAINORG0100HMAIN:MOVP0,#0FFHMOVB,#4MOVP3,#0F0H;0JNBP3.4,L1JNBP3.5,L2JNBP3.6,L3JNBP3.7,L4AJMPMAINL1:MOVAJMPLL1L2:MOVAJMPLL1L3:MOVAJMPLL1L4:MOVAJMPLL1LL1:ACALLDL10MS;MOVA,P3XRLA,#0F0HJZMAINMOVP3,#0FH;行置0,看列电平JNBP3.0,L5JNBP3.1,L6JNBP3.2,L7JNBP3.3,L8L5:MOVAJMPKEYL6:MOVAJMPKEYL7:MOVAJMPKEYL8:MOV20H,#3AJMPKEYKEY:MOVA,R1;计算键值并查表赋值MULABADDA,20HMOVR2,AMOVDPTR,#TABLEMOVA,R2MOVCA,@A+DPTRMOVP2,ACALLBEEP_BLLCALLDELAYLJMPMAINDELAY:MOVD1:DELAY:MOVD1:D2:R5,#50延时R6,#20R7,#50DJNZDJNZDJNZRETR7,$R6,D2R5,D1DL10MS:MOVR7,#05HLOOP1:MOVR6,#0F9HLOOP2:NOPNOPDJNZDJNZRETTABLE:DB0A0H,0F9H,0C4H,0D0H,99HDB92H,82H,0F8H,80H,90HDB88H,83H,0A6H,0C1H,86HDB8EHEND时，调分。源程序：ORG0000HLJMP1000HORG001BHAJMP0100HORG0100HMOVTH1,#0D8HMOVTL1,#0F0HDJNZ69H,TT1MOV69H,#100SETB4FH

3个键实现复位，TT1:RETI;中断延时ORG1000HMOV30H,#1MOV31H,#2MOV32H,#0MOV33H,#0MOV34H,#0MOV35H,#0MOVTMOD,#10HMOVTH1,#0D8HMOVTL1,#0F0HMOVIE,#88HXS0:SETBTR1MOV69H,#100CLR4FHXS00:LJMPKEYKEY;判断按键有无按下LX1:CJNEA,#0A0H,LX2LJMPP100LX2:CJNEA,#0F9H,LX3LJMPP1000LX3:CJNEA,#0C4H,XSLJMPP10000XS:MOV40H,#01HMOVDPTR,#TABMOVP0,40HMOVA,30HMOVCA,@A+DPTRMOVP2,ALCALLYS1MSMOVP2,#0FFHMOVA,#42HMOV40H,AMOVP0,40HMOVA,31HADDA,#10MOVCA,@A+DPTRMOVP2,ALCALLYS1MSMOVP2,#0FFHMOVA,#44HMOV40H,AMOVMOVA,32HMOVCA,@A+DPTRMOVP2,ALCALLYS1MSMOVMOVA,#48HMOV40H,AMOVP0,40HMOVA,33HADDA,#10MOVCA,@A+DPTRMOVP2,ALCALLYS1MSMOVMOVA,#50HMOV40H,AMOVMOVA,34HMOVCA,@A+DPTRMOVP2,ALCALLYS1MSMOVMOVA,#60HMOV40H,AMOVMOVA,35HMOVCA,@A+DPTRMOVP2,ALCALLYS1MSMOVP2,#0FFHMOVA,#40HMOV40H,AJNB4FH,LLLL1CLR4FHLJMPJIALLLL1:LJMPP100:MOV30H,#0MOV31H,#0MOV32H,#0MOV33H,#0MOV34H,#0MOV35H,#0JIA:MOVR1,#14HMOVA,35HCJNEA,#9,JIA1MOV35H,#0MOVA,34HCJNEA,#5,JIA10MOV34H,#0P10000:MOVA,33HCJNEA,#9,JIA100MOV33H,#0MOVA,32HCJNEMOV32H,#0P1000:MOVA,31HCJNEA,#9,JIA10000MOV31H,#0MOVA,30HCJNEA,#2,JIA100000MOV30H,#0AJMPXSJIA100000:INC30HAJMPXS0JIA10000:CJNEA,#3,JIAJIAMOVA,30HCJNEMOV30H,#0MOV31H,#0AJMPXS0JIAJIA:

INC31HAJMPXS0JIA1000:INCAJMPXS0JIA100:INC33HAJMPXS0JIA10:INC34HAJMPXS0JIA1:INC35HAJMPRETYS1MS:MOVR6,#9HYL1: MOVDJNZR7,$DJNZRETDL10MS:MOVR7,#05HLOOP1:MOVR6,#0F9HLOOP2:NOPNOPDJNZDJNZRETDELAY:MOVR5,#50D1:MOVD2:MOVR6,#20R7,#248D1:MOVD2:MOVR6,#20R7,#248DJNZ R7,$DJNZ DJNZ RETKEYKEY:MOVB,#4MOVP3,#0F0H;0JNBP3.4,L1JNBP3.5,L2JNBJNBAJMPXSL1:MOVAJMPLL1L2:MOVAJMPLL1L3:MOVAJMPLL1L4:MOVAJMPLL1LL1:ACALLDL10MS;消抖MOVA,P3XRLA,#0F0HJZLLL2MOVP3,#0FH;0JNBP3.0,L5JNBP3.1,L6JNBJNBL5:JNBMOV20H,#0AJMPKEYL6:JNBMOV20H,#1AJMPKEYL7:JNBP3.2,L7MOV20H,#2AJMPKEYL8:JNBMOV20H,#3AJMPKEYLLL2:LJMPXSKEY:MOVA,R1;计算键值并查表赋值MULABADDA,20HMOVR2,AMOVDPTR,#TABLEMOVA,R2MOVCA,@A+DPTR;LCALLLJMPLX1TAB:DB0A0H,0F9H,0C4H,0D0H,099H,092H,082H,0F8H,080H,090HDB020H,079H,044H,050H,019H,012H,002H,078H,000H,010HTABLE:DB0A0H,0F9H,0C4H,0D0H,99HDB92H,82H,0F8H,80H,90HDB88H,83H,0A6H,0C1H,86HDB8EHEND七、1602液晶显示功能描述：在lcd上动态逐字显示两行字符串。LCD2-Mi飢订err.............................Ut3325Ri

MALIdJfTAL2RSTPSENALEQ了「2pJI.4FJ$AT8BCS1

PO.O/ADORO.I/ADIP01/AD2POJ/^Ct)F1].4//i£4PO.S5/AD5PD.fi/ADBFDHF陀.MSF2.1//UP2.2/AWR2JXA11IP2.4/A12般.引AMP3g14P2.7/A15 /；■dllJJlJpj.onxDFi.i/TNTPH.卯JJlJn.4m曲EP37/RD源程序：RSEQUP2.7RWEQUEEQUP2.5ORGOOOOHLJMPMAINORGO1OOHMAIN:ACALLDEL5MSACALLDEL5MSACALLDEL5MSMOVP1,#38HACALLENABLE1ACALLDEL5MSMOVP1,#38HACALLENABLE1ACALLDEL5MSMOVP1,38HACALLENABLE1MOVP1,#OOOOOOO1BACALLENABLEMOVP1,#OO111OOOBACALLENABLEMOVP1,#OOOO1111BACALLENABLEMOVP1,#OOOOO1OOBACALLENABLEMOVP1,#8FHACALLENABLEMOVACALLL1MOVP1,#0CFHACALLENABLEMOVACALLL2SJMP$L1:MOVR1,#00HLL1:MOVA,R1MOVCA,@A+DPTRMOVP1,AACALLDELXXMSACALLWRITE_LCDINCR1CJNEA,#00H,LL1RETL2:MOVR1,#00HLL2:MOVA,R1MOVCA,@A+DPTRMOVP1,AACALLDELXXMSACALLWRITE_LCDINCR1CJNEA,#00H,LL1RETWRITE_LCD:SETBRSCLRRWCLREACALLDELAYSETBERETENABLE1:CLRRSCLRRWCLRESETBERETENABLE:CLRRSCLRRWCLREACALLDELAYSETBERETDELAY:MOVP1,#0FFHCLRRSSETBRWCLRENOPSETBEJBP1.7QELAYRETDEL5MS:MOVR7,#125DEL1:MOVR6,#18NOPDEL2:DJNZR6,DEL2DJNZR7,DEL1RETDELXXMS:MOVDEL3:MOVR6,#250NOPDEL4:DJNZR6,DEL4DJNZRETtable1:db"UHZNAIT "table2:db"*********:QQ END八、外部RA MT 功能描将片内数到片外RAM储

据送存，睡D 1o 352-3D2

^ASATDJMDtD_

NQQQQQ

MMMAJ辽I

oI13-QQQ

CE-LD 21一 Q：再送回片, 1:

TOE虫一VCCJ源程序：ORG0000HLJMPMAINORG0100HMAIN:MOVP0,#0FFHMOVA,#0F9HMOVDPTR,#0001HEND

MOVX@DPTR,ACLRAMOVXA,@DPTRMOVP2,ASJMP$九、AD转换功能描述：向ADC080输入模拟信号电压，经转换后在数码管上显示电压值ucP31it-------oP3C6

>CLKSTARTOE

vcc 11r^1-:INDnc2DGIMIN5尹 IN6T.-~

DO bFriiDI ITS匸DJ 匸口D3D4D5D6 3iF-D-ADDAADDSAHDCAALE

EOCR£F+REF- 15源程序：LED_0EQU LED_1EQU LED_2EQU ADCEQU CLOCKBITP3.1STBITP3.0;ALEOEBITP3.2EOCBITP3.3

CrXD

GXDAI>C0E：WORG0000HLJMPSTARTORG000BHCPLCLOCK;给0809时钟RETIORG0100HSTART:MOVLED_0,#00HMOVLED_1,#00HMOVLED_2,#00HMOVTMOD,#02HMOVTH0,#0FEHMOVTL0,#0FEHMOVIE,#82HSETBTR0WAIT:CLRSTSETBSTCLRSTJNBSETBOEMOVCLROEMOVA,ADCMOVB,#51DIVABMOVMOVA,BMOVB,#5DIVABMOVMOVA,BMOVB,#2MULABMOVLED_0,ALCALLDISPSJMPWAITDISP:MOVP0,#00HMOVDPTR,#TABLEMOVA,LED_0MOVCA,@A+DPTRSETBP0.2MOVP2,ALCALLDELAYCLRP0.2MOVA,LED_1MOVCA,@A+DPTRSETBP0.1MOVP2,ALCALLDELAYCLRP0.1MOVA,LED_2MOVCA,@A+DPTRSETBPO.OADDA,#80HMOVP2,ALCALLDELAYCLRRETDELAY: MOVD1: MOVR7,#15DJNZR7,$DJNZR6,D1RETTABLE:DB0A0H,0F9H,0C4H,0D0H,99HDB92H,82H,0F8H,80H,90H十、DA转换功能描述：实现输出方波、三角波、梯形波。源程序：方波程序ORG0000HLJMPORG0100H;通过高低电平地的变化来输出方波LOOP1:CLRP3.6MOVP2,#00H;向选通地址送低电平地ACALLDELAYM