DAC0832、DAC0809仿真实验指导

1、一、通过pl 口输入数字量，通过dac0832转换，观察模拟量输出 用普通i/o控制dac0832rp15.1ku519293o31" xtal1po.aadop0.1/ad1xtal2rstp0.2/ad2 p0.3/ad3 p04ad4 p0.ad5p0.6.-ad6p0.7/ad7p2.0/a8p2.1/a9p2.2/a10psenp2.3/a11alep2.4/a12eap2.5/a13p2.6/a14p2.7/a15p1.0p1.1p1 op3.a'rxd p3.1/txd p3.2'int0 pa.llnttp3.4仃0p13p1.4p15 pi ap35

2、.'t1p3&wrp3.7/rdr x>p1.7址上at89c51参考程序i：存储器映像的i/o技术org 0000hajmp main；转主程序lixu7-12vu8ua74121393837363534 33 32csvcc| c/dv1 idvownlilt(o ylfoyjgndwr2di3xferdi2di4di1di5diodi6vrefdi7rfbi0ut2gndiout15aco83220 19 18 17 j? 15 14m3j211dac0832的参考电压，决定模拟电压的输出范围 用外部存储器操作指令，实现对单片机外围设备的控制 称为存储器映像的i/o

3、技术main:mov p1,#offhmov p2,#0ffhloop:clr p2.0mov po,p1setb p2.0clr p2.1orl p2,#03hsjmp loopend二、通过pl 口输入数字量，通过dac0832转换，观察模拟量输出；用外部存储器操作指令，实现对单 片机外围设备的控制称为存储器映像的i/o技术rp15.1ku5空_ .xtal1xtal2工rstpo.o.'adop0.1/ad1 p0 2/ad2 p0.3/ad3 p0.4/ad4 p0.5/ad5 p0.6.ad6 p0.7/ad729 hzpsen ale eap2.0'a8p2.17a

4、9 p2.2a10 p2.3'a11 p2.4/a12 p2.5a13 p26a14 p2.7/a15p1.0 pl.1 pl.2pi.3 pi 4 p1.5pl.6 pi 7p3.arxdp3.1/txd p3.2/int0 p3.3/intt 卩34口0p3.5/t1p3awrp3 7.wcmu6q06q2q3q4q5q66at89c51u7csvccwr1ile(by1；by2)gndwr2di3xferdt2di4di1disdk)di6vrefdi7rfbiout2gndiout1 1219 1820167s"14+12vau8卜dac0832参考程序1org 00

5、00hajmp mainmain:mov ro,#ofehmovp1,#offhloop:mov a,p1movx r0,asjmp loopend三./*【例题8.1】:dac0832产生三角波.锯齿波.方波勺rp15.1ku5xtal1p0.0/ad0xtal2p0.1/ad1p0.2/ad2p0.3/ad3rstp0.4/ad4p0.5/ad5p0.6/ad6p0.7/ad7psenp2.0/a8p2.1/a9 p2.2/a10 p2.3/a11alep2.4/a12eap2.5/a13p1.0p2.6/a14p2.7/a15p3.0/rxdp1.1p3.1/txdp1.2p3.2/in

6、t0p1.3p3.3/int1p1.4p3.4.-t0p1.5p3.5/t1p1.6p3.6wrp1.7p3.7/rd12930"312 3 4 5 6 7 8at89c51l11u71027282,376172526u63938373635343332107tj21314154tt13141718do d1d2d3d4d5d6d7oe le74ls3732hz n912j5j6j9dbawr1 gndvccile(by1/by2)wr2 vccdui4arendi2di4di1di5diodi6vrefdi7rfbiout2gndiout1dac08324-12vlu8+ua741

7、20,1816751277参考程序1org 0000hajmp main;转主程序org ooobhajmpbrto ；转主程序org 0030hbrto:mov tlo,#oboh ;先装低八位mov th0,#3ch ;重装定时器初值djnz r4,next ;时间未到，则 next mov r4,#0ffh ;恢复 r4 初值setb f0next:retima1n:mov tmod,#01h;t0 为定时器方式 1mov th0,#3ch ;装入定时初值mov tl0,#0b0hmov ie,#82h ;开丁0 中断mov r4,#0ffh ;计数器ro赋初值20mov r0,#0fe

8、hclraclr f0setb tro;启动to计数next():clr foclraloop:movx r0,a；锯齿波incajnb f0,loopnext1:clr foclradown:movx r0,a；三角波incajnz down mova,#offhup:movx r0,adecajnz upjnb fo,downnext2:clr foloop1:clra;方波movx r0,a acall delay mova,#offhmovx r0,a acall delayjnb fo,loop1sjmp nextodelay:clr tromov r7,#01h;延时子程序dela

9、y 1:mov r6,#0fhdelay2:mov r5,#0ffhdelay3:djnz r5,delay3djnz r6,delay2djnz r7,delay1setb troretenddac转换实验1）参考电路a11 jo1 . 11 21 31 &1 51 s1 .7poo ax p0.1a3i p02仪 p03ax po4a>1 posax po&e pot at?p2da0 p21*) p22a10 矽糾11 pi"12 p25a13 p2&a14 p25u15p3&fxd 小卫d 疋初6 p33»nhp3ato p35

10、ti气±tcoo)d1d2虫c303cm01c5c6mq7ctie74k3t3u2?<is138咒y1yzy3y4巧"v72)参考程序(单缓冲方式转换程序) 三角波波程序org 0000hmov a,#00hmov r0,#0fchdown:movx r0,aacall delayincajnz downmov a,#0fehup: movx r0,aacall delaydecajnz upsjmp downdelay: mov r7, #01h /延时程序时间不 能太长，否则不工作delay 1:mov r6, #02hdelay2:mov r5, #05hdjn

11、z r5, $djnz r6, delay2djnz r7, delay 1 retend严org 0000h 方波程序mov a,#()()hstart: mov r0,#0fchloop: mov a,#33hmovx r0,aacall delaymov a,#0fehmovx r0,aacall delaysjmp loopdelay: mov r7, #02h 延时程序时间不能太长，否则不工作delay 1:mov r6, #08hdelay2:mov r5, #08hdjnz r5, $djnz r6, delay2djnz r7, delay 1retendorg 0000h锯齿

12、波程序mov a,#00hmov r0,#0fchloop: movx r0,aacall delayincasjmp loopdelay: mov r7, #02h 延时程序时间不 能太长，否则不工作delay 1:mov r6, #08hdelay2:mov r5, #08hdjnz r5, $djnz r6, delay2djnz r7, delay1 retend*/rp110kuaicix)u9at 卜 o x1c2|严|讪中c3rd100gjl4xtallp0qad3p0 1.ad1p02ad2xta12p0 3 ad3p0 4.ad4p0 5. ad5rstp07.ad7p2 g

13、a8p2 va9p2.2a10pfwnp2sa11alcp2 a a12fcap2.5a13p2gaup2,7.'a15piop3 0-rx3pi 1p31/tx0pi2p3 2.1ni0p13p3 3.1nt1pi 4p34/t3pi5p3 5.t1p16p36wrpi 7p37.tou11/ *1 1片|at89g51igp2.q/2?/y24/25/y/28/10%工74hc74u3j2u6a74ls0?ce le74ic373e2 £374 3874-c74i r16ll,k74l$cc?u6:bu5akh74lscm2clockmstartmcumaddaout6a

14、ddscut?adoccutsal£vreft| ocaoooace7f7kqqa|rif<l1 rifa.i<li rifa.r1<li rifa.1r9tafrnh1r7ikr2 ik1忠red采用中断法轮流采集ad转换的数字量org 0000hajmp mainorg 0013hajmpcint1不能太长，否则不工作delay1:mov r6, #0f0hdelay2:mov r5, #05hdjnz r5, $djnz r6, delay2djnz r7, delay 1 retmain:栈指针org 0100hmov sp,#60h；设置堆endsetb ea set