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时间:2019-08-29
《方波频率计实验报告》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、简易数字频率计实验报告主要技术指标和要求:(1)被测信号的频率范围100H/〜900kHz(2)输入信号为正弦信号或方波信号(3)六位数码管显示所测频率(4)【摘要】在电子系统非常广泛应用领域内,到处可见到处理离散信息的数字电路,在电子技术屮,频率是最基本的参数Z—,并且与许多电参量的测量方案、测量结果都有十分密切的关系,因此频率的测量就显得更为重要。测量频率的方法有多种,其中电子计数器测量频率具有精度高、使用方便、测量迅速,以及便于实现测量过程自动化等优点,文章主要阐述了选择单片机作为核心器件,采用模块化布局,设计了一个简易数字频率计的过程。实验电路原理图:12U1XTM1XTALZR
2、arz&VSBfALEEKZZ2*2$Z?10*11"1Z•13~U1516"T・••••••••PODfACOPQ.V^JD!PCJNM2poar/oapa咖.PDGMPO.7ZAP7PZD*>Gpz.v>ePZ^AOP2^A11P2.^AtZP2SfAOP2J&AUP2.7fA15pggP3.1H>OpnNnnTJPZ3HWHP3.4H0P3ST1P:3j6顾P3.7/KFTVCG•A伯fU2AOMD图1简易数字频率讣电路图本电路主要由三部分组成:1)、单片机控制模块(AT89S52)2)、由74LS138与8位数码管构成的显示模块3)、由频率输入信号与频率计组成的频率输入模块实验模
3、拟结果图展示:图2输入信号为900KHZ■■p«nr2P».«
4、r3XP'ipi<3P»AP»AP>£P22A>DP23AHP2>MA<2P2^A«3P2HA«3>3U1XrjlL2益益益sn.llNmu.nEFDEE23«^u—TTP(0I9・"IF—FTTFP(flr2PIJPXXP»2P«JP»AP»^P«aP«ZP2OJU1P2JIA3P22AIQPZ3A»5、F3JKWraafniraafTrrwxropaaWTTpfl.nHTU1-91-P'O~3T05555feCDEFQCF1Z34-O578■l・fl.nrrorJULLorP2I1A3P2JIA3P2JA'OP33AMP2/4AI2P2^A«3P2flA«P2.HAI5P«nr2EHR6、rzxFSJirWP*2paaRHTP<2raafprP«*P3>iroP»^njflriP>Apa«aETP'.rpa.nWPIOI.prnrrU2rgi33rrcxr>CND000555王图4输入信号为65536HZ~i~OKE□□IODO(hbo7、kP'Oi-P»«2-•BaU2CWIvn&V1JcM2rjVflVAVL2U*avr『9133"CXe图5输入信号为1000HZ程序代码:#include#defineucharunsignedchar#defineuintunsignedint#definesmPlcode#defineswgP2uchartable1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};〃数码管显示(0,1,2,00009)ucharcodetable2[]={0x08、0,0x01,0x02,0x03,0x04,0x05,0x06,0x07};//38译码器的转换组〃总计数数〃计时周期标志符uchartime=();uchart_count;unsignedlongtt;uinttimes[7];bitflag=0;voiddelay(uintz)〃延时函数{uinti,j;for(i=0;i9、ari;IE=0X8A;//开中断,TO,T1中断TMOD=0xl5;/fT0为定吋器工作于方式1,T1为计数器工作于方式1THl=0x3c;//定时器赋高8初值,12M晶振TLl=0xb0;//定时器赋低8初值,12M晶振TH0=0;//计数器赋高8初值初值TL0=0;//计数器赋低8初值TR1二1;//开定时器1TR0=l;while(l){if(flag==l){TR1=O;〃关闭T1定时器,定时IS完成TRO=O;//关闭T
5、F3JKWraafniraafTrrwxropaaWTTpfl.nHTU1-91-P'O~3T05555feCDEFQCF1Z34-O578■l・fl.nrrorJULLorP2I1A3P2JIA3P2JA'OP33AMP2/4AI2P2^A«3P2flA«P2.HAI5P«nr2EHR6、rzxFSJirWP*2paaRHTP<2raafprP«*P3>iroP»^njflriP>Apa«aETP'.rpa.nWPIOI.prnrrU2rgi33rrcxr>CND000555王图4输入信号为65536HZ~i~OKE□□IODO(hbo7、kP'Oi-P»«2-•BaU2CWIvn&V1JcM2rjVflVAVL2U*avr『9133"CXe图5输入信号为1000HZ程序代码:#include#defineucharunsignedchar#defineuintunsignedint#definesmPlcode#defineswgP2uchartable1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};〃数码管显示(0,1,2,00009)ucharcodetable2[]={0x08、0,0x01,0x02,0x03,0x04,0x05,0x06,0x07};//38译码器的转换组〃总计数数〃计时周期标志符uchartime=();uchart_count;unsignedlongtt;uinttimes[7];bitflag=0;voiddelay(uintz)〃延时函数{uinti,j;for(i=0;i9、ari;IE=0X8A;//开中断,TO,T1中断TMOD=0xl5;/fT0为定吋器工作于方式1,T1为计数器工作于方式1THl=0x3c;//定时器赋高8初值,12M晶振TLl=0xb0;//定时器赋低8初值,12M晶振TH0=0;//计数器赋高8初值初值TL0=0;//计数器赋低8初值TR1二1;//开定时器1TR0=l;while(l){if(flag==l){TR1=O;〃关闭T1定时器,定时IS完成TRO=O;//关闭T
6、rzxFSJirWP*2paaRHTP<2raafprP«*P3>iroP»^njflriP>Apa«aETP'.rpa.nWPIOI.prnrrU2rgi33rrcxr>CND000555王图4输入信号为65536HZ~i~OKE□□IODO(hbo
7、kP'Oi-P»«2-•BaU2CWIvn&V1JcM2rjVflVAVL2U*avr『9133"CXe图5输入信号为1000HZ程序代码:#include#defineucharunsignedchar#defineuintunsignedint#definesmPlcode#defineswgP2uchartable1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};〃数码管显示(0,1,2,00009)ucharcodetable2[]={0x0
8、0,0x01,0x02,0x03,0x04,0x05,0x06,0x07};//38译码器的转换组〃总计数数〃计时周期标志符uchartime=();uchart_count;unsignedlongtt;uinttimes[7];bitflag=0;voiddelay(uintz)〃延时函数{uinti,j;for(i=0;i9、ari;IE=0X8A;//开中断,TO,T1中断TMOD=0xl5;/fT0为定吋器工作于方式1,T1为计数器工作于方式1THl=0x3c;//定时器赋高8初值,12M晶振TLl=0xb0;//定时器赋低8初值,12M晶振TH0=0;//计数器赋高8初值初值TL0=0;//计数器赋低8初值TR1二1;//开定时器1TR0=l;while(l){if(flag==l){TR1=O;〃关闭T1定时器,定时IS完成TRO=O;//关闭T
9、ari;IE=0X8A;//开中断,TO,T1中断TMOD=0xl5;/fT0为定吋器工作于方式1,T1为计数器工作于方式1THl=0x3c;//定时器赋高8初值,12M晶振TLl=0xb0;//定时器赋低8初值,12M晶振TH0=0;//计数器赋高8初值初值TL0=0;//计数器赋低8初值TR1二1;//开定时器1TR0=l;while(l){if(flag==l){TR1=O;〃关闭T1定时器,定时IS完成TRO=O;//关闭T
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