《单片机的C语言程序设计与运用(第2版)》期末复习题及答案2

1、第四章中断类例4-1P104假设外部中断0和外部中断1均为下降沿触发,当外部中断0发生时,P0端口的电平反向,当外部中断1发生时,P1端口的电平反向U1AT89C5117"P37/RDP17P3.6AnJRPL6P3.5/T1PI5P3.4/TDPL4P3.3/INT1PL3P3J/IN1DPL2P3.1fD(DPL1P3.D/RXDPLOP2.77A15P2.67A14P2.5/A13EAP2.4/A12ALEP2.3/A11P$ENP2.2/A10P2.网P2.山纳P0.7/AD7R$TP0.6/AD6PO.5/AD5P0.4/AD4POJ/AD3XTA12PO.2/AD2PO.

2、1/AD1PO.O/AEOXTAL1<816J"7_15614:fl切412：11210"120-31272625'3024202g22-2132"33ie34-35二36"37193839R1interrupt0/P0端口反向interrupt2/P1端口反向#include<reg51.h>voidIS0(void)P0=P0;voidIS1(void)P1=P1;voidmain()P0=0x00;P1=0xFF;IT0=1;IT1=1;EX0=1;EX1=1;EA=1;while(1);在本实例中,首先通过P1.7口点亮

3、发光二极管D1,然后外部输入一脉冲用,那么发光二极管D1亮、暗交替.U1AT89C612122"232425-2627"VGND28/ID"1112'13B14f152167?"P2S巡P2.1回P2,2/A10P2,3/A11P2.4/A12P2.5/A13P2.6/A14P27/A15P3.0/RXDP3J/TXDP3.2/IN1DP3.3/INTTP34/TDP3,5(T1_P3.6逅P37/RUPSENALEEAPhDPI.2PL3PI.4PI.5PI.6P171235-678vcc293031R1470R#include<reg5

4、1.h>sbitP1_7=P1A7;voidinterrupt0()interrupt0using2/外部中断0P1_7=!P1_7;voidmain()EA=1;开中断IT0=1;/外部中断0脉冲触发EX0=1;外部中断0P1_7=0;dowhile(1);如果有3个脉冲,那么灯亮、暗交替一次,可如下面编程：#include<reg51.h>SbitP17=P1A7;unsignedchari=3;voidmain()EA=1;IT0=1;EX0=1;dowhile(1);voidinterrupt0()interrupt0i=i-1；if(i=0)P17=!P17;i=3

5、;【例4-10如图4-18所示,8只LED阴极接至单片机P0口,两开关S0、S1分别接至单片机引脚P3.2()和P3.3().编写程序限制LED状态.按下S0后,点亮8只LED;按下S1后,变为闪烁状态.47DR470R17161514iT"12,11,102S"27262524;23"P3.77RDPI7P3.6/WRP1.6P3.5/T1P1.5P34ToPL4P3.3/INT1P1.3P3.MNTDPI.2P3.1/D(DPklP3D/RXDFEOP27/A15P2.6XA14P2.6/A13EAP2.4/A12ALEP2.3/A11PSENP22XA1DP

6、2.1,施P20/PBP07/AD7RSTP06/AD6P0.5/AD5P04TAD4P03/AD3XTAL2PD.2/AD2P0.1XAD1PD.D/ADOXTAL1<U1ATO0C511921#include<reg51.h>sbitP32=P3A2;voiddelay(unsignedintd)/定义延时子函数while(-d>0);voidmain()P0=0xFF;/熄灭LEDIT0=1;IT1=1;外中断0、1脉冲触发方式EA=1;EX0=1;EX1=1;/开中断for(;)/延时等待中断发生；)voidINT0_ISR()interrupt0/外中断0中断

7、效劳函数P0=0x00;voidINT1_ISR()interrupt2/外中断1中断效劳函数while(P32!=0)如果有外部中断0,那么退出delay(5000);P0=0x00;delay(5000);P0=0xFF;定时类【例4-16】设单片机的fosc=12MHz,要求在P1.0上产生周期为2ms的方波.要在P1.0上产生周期为2ms的方波,定时器应产生1ms的周期性定时,定时到对P1.0取反.要产生1ms的定时,应选择方式1,定时器方式.TMOD确实定：选择定时器/计数器T0,定时器方式.方式1,GATE不起作用,高4位为0000,TMOD=01H.TH、TL确实定：单片机的fo

8、sc=12MHz,那么单片机的机器周期为1ms,1ms=1000ms,计数器的计数初值为65536-1000,TH0=(65536-1000)/256,TL0=(65536-1000)%256.采用查询方式程序如下：#include<reg51.h>sbitP1_0=P1A0;voidmain(void)TMOD=0x01;TR0=1;for(;)TH0=(65536-1000)/256;TL0=(65536-1000)%256;dowhile(!TF0);P1_0=!P1_0;TF0=0;采用中断方式程序如下：#include<reg51.h>sbitP1_0=P1A

9、0;voidtimer0(void)interrupt1using1P1_0=!P1_0;TH0=(65536-1000)/256;TL0=(65536-1000)%256;voidmain(void)TMOD=0x01;P1_0=0;TH0=(65536-1000)/256;TL0=(65536-1000)%256;EA=1;ET0=1;TR0=1;dowhile(1);U1AT80C51P3.4/T10P1.4P3.3/INTTP1.3P3.2/1NTDPk2P3JJTXDP1.1P3.0/RXDproP27/A15P2.6/A14_P2.5/A13EAP2.4/A12ALEP2.3<

10、;A11PSENP2.2/A1DP2.1,用P07/AD7R$TP0WAD6P0.5/AD5【例4-17】设系统时钟频率为12MHz,编程实现从P1.1输出周期为1s的方支.要输出周期为1s的方波,应产生500ms的周期性定时,定时到那么对P1.1取反即可实现.由于定时时间较长,一个定时器/计数器不能直接实现,一个定时器/计数器最长定时时间为65ms多一点,可以用以下两种方法实现.(1)方法一用定时/计数器T0产生周期性为10ms的定时,然后用一个变量对10ms计数50次.系统时钟为12MHz,定时/计数器T0定时10ms,计数值N为10000,选方式1,方式限制字为B(01H),那么初值X为

11、X=65536-10000.U117P3.7/RDP1.7816P3.6/WR-P1.6715P3.5/T1P1.5P34/T0P14614513P3.3/INT-P1.3412P3.2/INT0-P1.23P3.1/TXDP1.1P30/RXDP10210128P2.7/A15P2.6/A14P2.5/A13EA27263125_241P2.4/A12ALEP2.3/A11PSENP2.2/A10P2.1/A9P2.0/A8P0.7/AD7RSTP0.6/AD6P0.5/AD5P0.4/AD4P0.3/AD3XTAL2P0.2/AD2P0.1/AD1P0.0/AD0XTAL1d3012923

12、2221329333435361837383919AT89C51/定义计数变量/初始化#include<reg51.h>sbitP1_1=P1A1;unsignedchari;voidmain()i=0;TMOD=0x01;TH0=(65536-10000)/256;TL0=(65536-10000)%256;EA=1;ET0=1;TR0=1;while(1);)voidtime0_int(void)interrupt1中断效劳程序TH0=(65536-10000)/256;重载初始值TL0=(65536-10000)%256;/重载初始值i+;/每发生一次中断,计数变量加1if(

13、i=50)/发生50次中断,定时0.5msP1_1=!P1_1;i=0;/计数变量清零)(2)方法二用定时/计数器T1计数实现,对10ms计数50次.定时/计数器T1工作于计数方式时,计数脉冲通过T1(P3.5)输入.设定时/计数器T0定时时间到对P1.0取反一次,那么T1(P3.5)每10ms产生一个计数脉冲,那么定时500ms只需计数25次,设定时/计数器T1工作于方式2,初值X=256-25=231,TH1=TL1=231.由于定时/计数器T0工作于方式1,定时方式,那么这时方式限制字为B(61H).定时/计数器T0和T1都采用中断方式工作.17P3.7/RDP1.7P3.6/WR-P1

14、.6P3.5/T1P1.5816-r1561413工1P3.4/T0P1.4P3.3/INT丁P1.3P3.2/INT0-P1.2P3.1/TXDP1.1P3.0/RXDP1.0P2.7/A15P2.6/A145"4""2"1012827311""302625P2.5/A13EAP2.4/A12ALE2429P2.3/A11PSENP2.2/A10P2.1/A9P2.0/A8P0.7/AD7RSTP0.6/AD6P0.5/AD5P0.4/AD4P0.3/AD3XTAL223222-32933343536183738P0.2/AD2P0

15、.1/AD1P0.0/AD0XTAL143919AT89C51U1#include<reg51.h>sbitP1_1=P1A1;sbitP1_0=P1A0；voidmain()TMOD=0x61;初始化TH0=(65536-10000)/256;TL0=(65536-10000)%256;TH1=231;TL1=231;EA=1;ET0=1;ET1=1;TR0=1;TR1=1;while(1);)voidtime0_int(void)interrupt1TH0=(65536-10000)/256;TL0=(65536-10000)%256;P1_0=!P1_0;)/T0中断效劳程序

16、/重载初始值/重载初始值voidtime1_int(void)interrupt3P1_1=!P1_1;/T1中断效劳程序【例4-18】设系统时钟频率为12MHz,编程实现：P1.1引脚上输出周期为1s,占空比为20%的脉冲信号根据输出要求,脉冲信号在一个周期内高电平占0.2s,低电平占0.8s,超出了定时器的最大定时间隔,因此利用定时器0产生一个基准定时配合软件计数来实现.取50ms作为基准定时,采用工作方式1,这样这个周期需要20个基准定时,其中高电平占4个基准定时.#include<reg51.h>sbitP1_1=P1A1;unsignedchari;/定义计数变量void

17、main()i=0;TMOD=0x01;/初始化TH0=(65536-50000)/256;TL0=(65536-50000)%256;EA=1;ET0=1;TR0=1;while(1);)voidtime0_int(void)interrupt1TH0=(65536-50000)/256;TL0=(65536-50000)%256;/中断效劳程序/重载初始值i=i+1;if(i=4)P1_1=0;elseif(i=20)P1_1=1;/高电平时间到变低周期时间到变高i=0;/计数变量清零U1AT8QC511311»1D»"28"26T25,24232f

18、32羽.34-P27/A15P2.6/A14P2.5/A13P2.4/A12P2.3/A11P2.2/A1DP2.1闺P2W闱PO7/A137POB/AD0PO5/AD5EAALEPSENRSTP3.4/TOPL4P3.3/JNTLPL3P3.2/IN1DP1二P11E(口PIJP3.D/RXDP1.0l3_1302&弟五早【例5-9】用行自发自收UIATO9C5I54"3'-2r1TE虹口近工上门一如一上如近中一吐"111H112-2-2-2-2-2-2-2-2-2-3-3-3甯.况.39"P2.7/RDP3.6Af¥R用5m.可710

19、pa.a/itnT叩&丽币ps.inxD图WRMOP27伊15?2.C/A14阻5rAi5M.47冏2P2.3/A11P2.2/A1OR21/MP工口倒P0.7/AD7PC.e/Affi叩.52刖.中国*P0.3/AD3PdPC.I/AD1P0.WADDKTAL1wcc#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintvoidmain()uchari=0x55;uintj=0;TMOD=0X20;/设定定时器1模式2TL1=TH1=0XF4;PCON=0X00;SCON=0X50;TR1=1;whi

20、le(1)SBUF=i;/发送数据do()while(!RI)RI=0;TI=0;i=SBUF;/读取接收数据P1=i;i=i;/将发送数据取反for(j=0;j<12500;j+);【例5-10】两个单片机串行通信1oowqadlLow-dor豆苻豆eowwndl-34,E2nwb-aL意®£IWNLrw«'2寻mlws寸iwe口XEmmILKt-2.,ED.FItzll/yNdEfMJVaffd回叫£bHNE门EELIXCLDLcnwqndl-owns<sdt豆晶£?-£niwzLIWEUMmIW5寸IWO91

21、ag口XEmmu.口xl/lmilaLNW,：EBIENW£LWdwvgEn.剧叫£LMJX.-1l-SKNwsln.UJm6LwlxAU1/W9CS1删删单片机1的C51源程序代码:#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharvoidmain()uchari;TMOD=0x20;TH1=TL1=0xff;SCON=0x50;PCON=0x80;TR1=1;P1=0xff;while(1)P1=0xff;i=P1;SBUF=i;while(TI=0);TI=0;单片机2的C51源程

22、序：#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharvoidmain()uchari=0;TMOD=0x20;TH1=TL1=0xff;SCON=0x50;PCON=0x80;TR1=1;while(1)while(RI=0);RI=0;i=SBUF;P1=i;两个单片机串行通信2C51源程序代码如下：#include<reg51.h>/TR=1,发送/等待乙机应答信号/乙机未准备好,继续联络/用行口初始化子函数/发送/接收/T1工作于方式2用行口工作于方式1,REN=1/发送联络信号/等待一

23、帧发送完毕/发送完毕,标志位满0校验和变量满0/发送一个数据#defineucharunsignedchar#defineTR1ucharidatabuf10;ucharpf;voidmain()int();if(TR=0)send(buf);elsereceive(buf);/*用口初始化子函数*/voidinit(void)TMOD=0x20;TH0=0xE8;TL0=0xE8;TR1=1;SCON=0X50;/*发送子函数*/voidsend(ucharidata*d)uchari;doSBUF=0xAA;while(TI=0);TI=0;while(RI=0);RI=0;while(S

24、BUFA0xBB!=0);dopf=0;for(i=0；i<10；i+)SBUF=di;pf+=di;/计算校验和while(TI=0);TI=0;SBUF=pf;while(TI=0);TI=0;while(RI=0);RI=0;while(SBUF!=0);/*接收函数*/voidreceive(ucharidata*d)uchari;dowhile(RI=0);RI=0;while(SBUFA0xAA)!=0);SBUF=0xBB;while(TI=0);TI=0;while(1)pf=0;for(i=0;i<10;i+)di=SBUF;pf+=di;while(RI=0);

25、RI=0;If(SBUFApf)=0)SBUF=0x00；break;elseSBUF=0xFF;while(TI=0);TI=0;/发送校验和/等待乙机应答/答复出错,那么重新发送判断甲机是否请求/发应答信号/清校验和/接收数据/计算校验和/接收甲校验和比拟校验和/校验和相等发0x00/校验和不相等,发0Xff第六章静态：【例6-1】利用单片机的并行作为静态显示的输出口的例如6-»(TAL1IPO.D/dADDP0J/AD1P0.3/AD3ndu?4DidXTALIrU-WjKU4po-syAos口门77AFT?口CTrU-fAHUrP2.1ZflP2.2ZA1DPSENALEcX

26、P2.3/A11PiAfAlino匹,P2.7XA15PI0Pl1Pl,2Pl3PI4PI5PI.6PI7口勺flr-J.UPSAlUP3.1/D(Ci口嚏iTFTTT沪/一强1uP3.5/T1P3.6>rJnUig18U1W189C51a.363-374-3656-34?*338"222110»罡25VCC2628ID2"11L12413S"146-15?"1617gF!"NDR1GNDfiOBOAl62AJB3A*B4洛B56眦汽B7AB/BA1917!®10"151413h1211U274LS245an

27、OUei口.B3Rdno&GB77rpLcMO/BrrU3'171015141312R9静态轮流显示“12-"和“AEfflC51源程序如下：#include<reg51.h>#defineucharunsignedcharuchardatadis_buf2;/显示缓冲区ucharcodeable18=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40,0x00;/显示的代码表voiddl()unsignedinti;for(i=0;i&l

28、t;40000;i+);voiddisplay(void)/显示函数ucharsegcode;segcode=dis_buf0;/°0口显示segcode=tablesegcode;P0=segcode;segcode=dis_buf1;/P3口显示segcode=tablesegcode;P3=segcode;voidmain(void)主函数while(1)dis_buf0=1;dis_buf1=2;/显示12display();dl();dis_buf0=16;dis_buf1=16;/显示-display();dl();dis_buf0=10;dis_buf1=11;/显示A

29、Bdisplay();dl();)例如中的显示函数display.可以再简单一些,如下面程序段：voiddisplay(void)P0=tabledis_buf0;/P0口显示P3=tabledis_buf1;/P3口显示)动态：【例6-3】利用MCS-51单片机的并行口作为动态显示的段口与位口的例如6位数码管动态显示的C51源程序如下1)随机调用#include<reg51.h>#defineucharunsignedcharuchardatadis_buf6;/显示缓冲区ucharcodetable18=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x

30、07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40,0x00;/代码表voiddl_ms()延时1ms函数unsignedintj;for(j=0;j<200;j+);voiddisplay(void)显示函数ucharsegcode,bitcode,i;bitcode=0xfe;/位码赋初值for(i=0;i<6;i+)segcode=dis_bufi;/显示缓冲器内容查表P0=tablesegcode;P3=bitcode;dl_ms();P3=0xff;关闭显示bitcode=bitcode<<1;/调整位码bitcod

31、e=bitcode|0x01;)voidmain(void)dis_buf0=1;dis_buf1=2;dis_buf2=3;dis_buf3=4;dis_buf4=5;dis_buf5=6;while(1)display();)(2)定时调用定时调用是通过定时器/计数器的定时功能来定时一定的时间(如20ms),定时时间到来调用显示函数.voidmain(void)定时调用TMOD=0x01;TH0=-20000/256;TL0=-2000%256;EA=1;ET0=1;TR0=1;dis_buf0=1;dis_buf1=2;dis_buf2=3;voidtime0_int()interrup

32、t1TH0与0000/256;TL0=-2000%256;display();)dis_buf3=4;dis_buf4=5;dis_buf5=6;while(1);)【例6-6】独立式按键例如恒T巾GNB7C51源程序如下:>XTAL1FDOHDDP口川DIP口皿DNXTAL2PEiaftDJR©TFtL?jADTP2,19股决1口PSENF2311ALEP2,412EA吆&*HP2.7A15F1£113Mx口P1.1?3.imCDP12"到1所市P33flNT1pi.<pa.muiF1J5知T1P1£n?mxffFU1AH3SC51

33、2等traR10IiI121IIJ2U传玉17#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintuchardatakey2;codeuchardirtab=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80;voiddl_6()uinti;for(i=0;i<600;i+);voidkey()ucharkey1;P1=0xff;key1=P1;if(key1!=0xff)dl_6();P1=0xff;key1=P1;if(key1!=0xff)key1=P1;sw

34、itch(key1)case0xff:key2=8;break;case0xfe:key2=0;break;case0xfd:key2=1;break;case0xfb:key2=2;break;case0xf7:key2=3;break;case0xef:key2=4;break;case0xdf:key2=5;break;case0xbf:key2=6;break;case0x7f:key2=7;break;default:break;voidmain()key2=8;while(1)(key();P3=dirtabkey2;)【例6-7】4X4矩阵键盘例如也胸理期咂m.WJi咋册If范如

35、K比牺T町期11吃UM2PU5WI13空用I*n.inisP'DF'D031至fjjiFtFN.<TDTJ£FT1_F17FGUO#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintuchardatadir_buf;codeuchardirtab=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40;codeucharkeytab=0xee,0xed,0xeb,0

36、xe7,0xde,0xdd,0xdb,0xd70xbe,0xbd,0xbb,0xb7,0x7e,0x7d,0x7b,0x77;voiddelay(void);voidkeyscan();voiddir();ucharkey;voidmain(void)dir_buf=16;while(1)keyscan();dir();)voiddir()P2=dirtabdir_buf;voiddelay(void)uchari;for(i=0;i<200;i+);voidkeyscan()ucharcode_h,code_l,i1,i2;P1=0xf0;所有的彳r输出0code_l=P1;/读列值c

37、ode_l=code_l&0xf0;/屏蔽掉高4位if(code_l!=0xf0)delay();/P1=0xf0;code_l=P1;code_l=code_l&0xf0;if(code_l!=0xf0)code_h=0xfe;for(i1=0;i1<4;i1+)kk:P1=code_h;code_l=P1;code_l=code_l&0xf0;if(code_l=0xf0)code_h=(code_h<<1)|0x01;gotokk;gotoll;/forll:code_h=code_h&0x0f;key=code_h+code_l;for

38、(i2=0;i2<16;i2+)if(key=keytabi2)dir_buf=i2;)*【例6-10一个8X8共阴极LED点阵显示ILOVEYOU(不用记)一个8X8在某一个时刻只能显示一个字符,要想显示字符串,必须在显示完一个字符后接着显示下一个字符,因此需要建立一个字符串库.由于每个字符有8个段码值,该字符串有8个字符,所以该字符串库中有8X8共64个段码值.字符串ILOVEYOU的字模段码值I00H,00H,42H,7EH,42H,42H,00H,00HL00H,42H,7EH,42H,02H,02H,02H,00HO00H,3CH,22H,42H,42H,22H,3CH,00H

39、V00H,40H,70H,0CH,0CH,70H,40H,00HE00H,42H,7EH,4AH,4AH,5AH,22H,00HY00H,40H,62H,1EH,12H,60H,40H,00HO00H,3CH,22H,42H,42H,22H,3CH,00HU00H,7CH,46H,02H,02H,7CH,40H,00HPI.7P3.7/TOFl6P3.6AAFFl5P35/T1P»4P3.4ZTDFl.3P3,MNT1PI2P3.2/INTOP1JP3.1/TXDF1.0P3JWRXOP2.7/A15P2.6/A14EAP2.5/A13WEPSEMP1.3/A11P2.2/A10P2

40、.1/淡PLftWGR£TP07；AD7PD.S/AD6FD.5/MJ5P0.47AD4XTALtPD.3/AD3PD.2/AD2FO.UADII,XTAUPD.D/ADOU134235相37二招国175、16t15&六141312311121>101日Y7EY16ElY5Y4nCYIYlAU274LS13SUTZRP1110k#include<reg51.h>#defineuintunsignedint#defineucharunsignedcharcodeuchartab1=0x00,0x00,0x42,0x7e,0x42,0x42,0x00,0x00,

41、/I0x00,0x42,0x7e,0x42,0x02,0x02,0x02,0x00,/L0x00,0x3c,0x22,0x42,0x42,0x22,0x3c,0x00,0x00,0x40,0x70,0x0c,0x0c,0x70,0x40,0x00,x00,0x42,0x7e,0x4a,0x4a,0x5a,0x22,0x00,0x00,0x40,0x62,0x1e,0x12,0x60,0x40,0x00,0x00,0x3c,0x22,0x42,0x42,0x22,0x3c,0x00,0x00,0x7c,0x46,0x02,0x02,0x7c,0x40,0x00;/Ucodeuchartab2=0

42、x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07;dataucharj;voiddelay(uintn)datauinti;for(i=0;i<n;i+);voiddir()dataucharh,v=0;for(h=j;h<j+8;h+)P0=tab1h;P3=tab2v;delay(555);P3=0xff;v+;if(v=8)v=0；)voiddl()uintr;for(r=0;r<40;r+)dir();voidmain(void)while(1)j=0;dir();dl();j=8;dir();dl();j=16;dir();dl();j=

43、24;dir();dl();j=32;dir();dl();j=40;dir();dl();j=48;dir();j=56;dir();dl();*例6-12编程在LCD1602上显示由键盘输入的字符或数字.(不用记)JM31M|闻？A23M5陋f""7fXTALIPD.Dj>ADDPOJ/DIP0.2JAD2XTA12PD.1ZAD5FD.4>AD4PD.5WD5PD.WADSfiSTFCI.7/AD7F2J/WP2.JZAWP2.3/A114LEP2.4/A11亭P2.5W13P2.9M14FLOP.MRXDF1.1F3.1/TXDP1,2Pq.irtNTU

44、P1.3P3.MNT1PI.4P3.4/TOP1.SP3.5/TIIP1.6P3B丽PI.7P3?/RffU2JU39C51I1X._I=LjQQ<寸<=.li,IOQ_<IQO口«-.11>iO-'11,1-0c1,o-1Lr-1II*_L>|*1.1,1oo".11产.-IL-"Oo|iO,一_n0/S51+1602,晶振为12M#include"reg51.h"#include"intrins.h"#include"absacc.h"sbitRS=P3A5;sb

45、itRW=P3A6;sbitE=P3A7;#definebusy0x80#defineucharunsignedchar#defineuintunsignedintuchara=,0,1,2','3',4','5',6,7','8',9,a,'b,c,d,e,f,;voiddelay_LCM(uchark)/延时函数uinti,j;for(i=0;i<k;i+)for(j=0;j<60;j+)；)voidtest_1602busy()/测忙函数P1=0xff;E=1;RS=0;RW=1;_nop_();

46、_nop_();while(P1&busy)检测LCDDB7是否为1E=0;_nop_();E=1;_nop_();E=0;voidwrite_1602Command(ucharco)/写命令函数test_1602busy();/检测LCD是否忙RS=0;RW=0;E=0;_nop_();P1=co;_nop_();E=1;/LCD的使能端高电平有效_nop_();E=0;voidwrite_1602Data(ucharData)/(test_1602busy();P1=Data;写数据函数RS=1;RW=0;E=1;_nop_()；E=0;voidinit_1602(void)/初始

47、化函数(write_1602Command(0x38);显示)delay_LCM(5);write_1602Command(0x01);/LCD功能设定,DL=1(8位),N=1(2行/去除LCD的屏幕delay_LCM(5);write_1602Command(0x06);1)delay_LCM(5);write_1602Command(0x0F);delay_LCM(5);/LCD模式设定,I/D=1计数地址加/显示屏幕voidDisplayOneChar(ucharX,ucharY,ucharDData)(Y&=1;X&=15;if(Y)X|=0x40;假设y为1(显示第

48、二行),地址码+0X40X|=0x80;/指令码为地址码+0X80write_1602Command(X);write_1602Data(DData);voiddisplay_1602(uchar*DData,X,Y)/显示函数ucharListLength=0;Y&=0x01;X&=0x0f;while(X<16)(DisplayOneChar(X,Y,DDataListLength);ListLength+;X+;voiddelay(uinti)/延时程序uintj;for(j=0;j<i;j+);ucharcheckkey()/检测有没有键按下uchari;ucharj;j=0x0f;P2=j;i=P2;i=i&0x0f;if(i=0x0f)return(0);elsereturn(0xff);ucharkeyscan()/键盘扫描程序ucharscancode;ucharcodevalue;uchara;ucharm=0;uchark;uchari,j;if(checkkey()=0)return(0xff);elsedelay(100);if(checkkey()