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1、ADC0809模数转换与显示（第四次实验）华侨大学08自动化实验目的：1.掌握ADC的使用控制方法。实验内容：基本要求：设计一程序采集ADC0809第3通道的电压值，将其转换为数字量，并在数码管上显示；5V显示为255,0V显示为000。扩展要求：将转换结果以两位小数精确显示，5V显示5.00,2.3V显示2.30，依次推广之。一、实验原理图：二、程序流程图：4开始定时器初始化，对ADC0809初始化，选择通道3给START一个脉冲，启动信号输入端判断EOC是否为0将OE置1读P3口数字数字处理，调用显示OE置0返回YN三、源程序1、基本要求：4OE
2、EQUP1.0EOCEQUP1.1STEQUP1.2CLKEQUP1.3SHUEQU30HTEMPEQU31HORG0000HAJMPMAINORG000BHCPLCLKRETIORG0100HMAIN:MOVSP,#60HMOVTMOD,#02HMOVTH0,#14HMOVTL0,#00HMOVIE,#82HSETBTR0MOVA,#3FHMOVP1,AMOVSHU,#0SCAN:CLRSTSETBSTCLRST4M0:JNBEOC,M0SETBOEMOVA,#0FFHMOVP3,AM1:MOVA,P3MOVSHU,ALCALLCHANGELCAL
3、LDISPCLROEAJMPSCANDISP:MOVR0,#TEMPMOVR2,#00HDISP1:MOVA,R2MOVDPTR,#TAB1MOVCA,@A+DPTRMOVP2,AMOVA,@R0MOVDPTR,#TABMOVCA,@A+DPTRMOVP0,AMOVR5,#5ACALLDELAYINCR0INCR2CJNER2,#3,DISP1MOVP0,#00HRETCHANGE:MOVA,SHUMOVB,#100DIVABMOVTEMP,AMOVA,BMOVB,#10DIVABMOVTEMP+1,AMOVTEMP+2,BRETDELAY:MOVR
4、6,#1DELAY0:MOVR7,#100DJNZR7,$DJNZR6,DELAY0DJNZR5,DELAYRETTAB:DB3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FHTAB1:DB0FDH,0FBH,0F7HEND42、扩展部分：4OEEQUP1.0EOCEQUP1.1STEQUP1.2CLKEQUP1.3SHUEQU30HTEMPEQU20HORG0000HAJMPMAINORG000BHCPLCLKRETIORG0100HMAIN:MOVSP,#60HMOVTMOD,#02HMOVTH0,#14HMOVTL0
5、,#00HMOVIE,#82HSETBTR0MOVA,#3FHMOVP1,AMOVSHU,#0SCAN:CLRSTSETBSTCLRSTM0:JNBEOC,M04SETBOEMOVA,#0FFHMOVP3,AM1:MOVA,P3MOVSHU,ALCALLHUANLCALLDISPCLROEAJMPSCANDISP:MOVR0,#TEMPMOVR2,#00HDISP1:MOVA,R2MOVDPTR,#TAB1MOVCA,@A+DPTRMOVP2,AMOVA,@R0MOVDPTR,#TABMOVCA,@A+DPTRMOVP0,AMOVR5,#5ACALL
6、DELAYINCR0INCR2CJNER2,#3,DISP1MOVP0,#00HRETHUAN:MOVA,SHUMOVB,#51DIVABADDA,#10MOVTEMP,AMOVA,BMOVB,#2DIVABMOVB,#10MULABMOVB,#25DIVABMOVTEMP+1,AMOVA,BMOVB,#2DIVABMOVB,#10MULABMOVB,#25DIVABMOVTEMP+2,ARETDELAY:MOVR6,#1DELAY0:MOVR7,#100DJNZR7,$DJNZR6,DELAY0DJNZR5,DELAYRETTAB:DB3FH,06
7、H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,0BFH,86H,0DBH,0CFH,0E6H,0EDH,0FDH,87H,0FFH,0EFHTAB1:DB0FDH,0FBH,0F7HEND44
