數(shù)模轉(zhuǎn)換仿真

1、微機(jī)控制技術(shù)仿真實(shí)驗(yàn)ADC0808 A/D轉(zhuǎn)換器的應(yīng)用A/D轉(zhuǎn)換器是一種能把輸入模擬電壓或電流信息變成與其成正比的數(shù)字量信息的電路 芯片。它用于實(shí)現(xiàn)模擬量到數(shù)字量的轉(zhuǎn)換。ADC0808是典型的8通道模擬輸入8位并行數(shù)字輸出的逐次逼近式A/D轉(zhuǎn)換器。該 轉(zhuǎn)換器采用COMS工藝，實(shí)現(xiàn)8路信號的模擬采集。片內(nèi)有8路模擬選通開關(guān)，以及相應(yīng) 的通道地址鎖存用譯碼電路。應(yīng)用1：用ADC0808作為A/D轉(zhuǎn)換器對滑動變阻器進(jìn)行測電壓。數(shù)碼管顯示范圍為0-255。 程序如下：#includeunsigned char code dispcode4=0 x10,0 x20,0 x40,0 x00;unsigne

2、d char temp;unsigned char dispbuf4;sbit ST=P3A0;sbit OE=P3A1;sbit EOC=P3A2;sbit CLK=P3A7;unsigned char count=0;unsigned char getdata;void delay(unsigned char m) while(m-);void main(void) ET0=1;ET1=1;EA=1;TMOD=0X12;TH0=216;TL0=216;TH0=(65536-4000)/256;TL0=(65536-4000)%256;TR1=1;TR0=1;while(1)ST=0;ST=

3、1;ST=0;while(EOC=0);OE=1;getdata=P0;OE=0;temp=getdata;dispbuf0=getdata/100;temp=temp-dispbuf0*100;dispbuf1=temp/10;temp=temp-dispbuf1*10;dispbuf2=temp;void T0X(void) interrupt 1 using 0 CLK=CLK;void T1X(void) interrupt 3 using 0 TH0=(65536-4000)/256;TL0=(65536-4000)%256;for(count=0;count=3;count+)P1

4、=dispbufcount|dispcodecount;delay(255);仿真結(jié)果：PDJlMDD PD.1/AD1 PD2MD2 Pd源而 PD.tDt PD5MD5 PDJ6WD6 P0.?jftD7assPE二DEFG DFP3J8WR P3.7/RDP22W1CP23W11P2.WA12P25mi3P2J6M14P2.Tft15P3U/RXD P3.1/TXD P32flN7TI PglNTIINDIN1IN2IN3IN 4INSIN6IN7CLOCKSTARTEOCOUT1OUT2 OUT3OUT*OUT5OUT6 OUTTOUT+5U:AADDA ADD B ADDC ALE1

5、2 a16 VREF(S VREF0.ADCtflETE：mPE邙EFG DFPD.UAD1PDJZAD2:m,L2PD.D3PDWD*PD.5,AD5PD.b,AD6RSTPD.TDTPM,徊P22ffl10PSENPW3利 11ALEP2.4,W12EAP2SW13P2.&WUF2.T15P1EP3U/RXDP1.1P3.1AXDP伍P32flN7IP1J3P3.31NT1P1.ipn.f-raP1J5P3.&T1P1.6Pgn.iRP1.TP3.T/RD5DC5112 aCLOCKSTARTEOCOUT1OUT2OUT3OUT*OUT5OUT6OUTT OUTB+a-VREF( VREF

6、-=TE：a-|REF( VREFQCLOCKS STARTADCtflE vTE柜*XTAL1pdhAddPOJ.-AD 1PEJRg:：TAL2PEJ.3也 D3PD.mi IPD.&ADbPD.&ADbRSTPD.T.ADTPWH闋P21腌P22.ft10PSENALEE4P2J5W13P2.b.A1lP2.TJW15pmPBEXDpuPn.1.T：DP12P321NTUpuP331NT1phP3.HT0P1SP3.5.T1P1 hP3.b.(n.iRP1.TP3.T/E DAQAaQBcQCDQDai/RBOQERBIQFLTQG應(yīng)用2：用ADC0808制作簡易的電壓表程序如下：#in

7、clude#include#define uchar unsigned charsbit P2_1=P2A1;sbit P2_2=P2A2;sbit P2_3=P2A3;sbit OE= P3A0;sbit EOC=P3A1;sbit ST=P3A2;sbit P3_4=P3A4;sbit P3_5=P3A5;sbit P3_6=P3A6;uchar code Ieddata_dot=0 x40,0 x79,0 x24,0 x30,0 x19,0 x12;uchar code leddata=0 xC0,0Xf9,0Xa4,0XB0,0 x99,0 x92,0 x82,0 xf8,0 x80,

8、0 x90;void delay(uchar n) uchar i,j;for(i=0;in;i+)for(j=0;j135;j+);void convert(uchar volt_data)uchar temp;P0=leddata_dotvolt_data/51;P2_1=1;delay(3);P2_1=0;if(volt_data%51)0 x19)P0=leddata(volt_data%51)*10/51;P2_2=1;delay(3);P2_2=0;elseP0=leddata(volt_data%51)*10/51+5;P2_2=1;delay(3);P2_2=0;temp=(v

9、olt_data%51)*10)/51)*10%51;if(temp0 x19)P0=leddatatemp*10/51;P2_3=1;delay(3);P2_3=0;elseP0=leddatatemp*10/51+5;P2_3=1;delay(3);P2_3=0;void main()uchar volt_data;P3_4=1;P3_5=1;P3_6=0;while(1)ST=0;_nop_();ST=1;_nop_();ST=0;if(EOC=0)delay(100);while(EOC=0);OE=1;volt_data=P1;OE=0;convert(volt_data);仿真結(jié)果：INDCLOCKIN1STARTIN2IN3BZiCIN*IN5OUT1I Nt；0UT2INTCHJT3CUJTiADDAGUTSADD BCHJTt；AD DC：CHJT7ALECiLUoVREFfVREF0OE309掃M(jìn) 的掃M(jìn)unooaav9no8 oavsinovaavnnoLLAOINIzino9NIunoSNIINI0C9CNI乙NlIdVJSINIxoaioNlCd liNwred OLNVz-Cd a