单片机da转换

1、D/A 转换实验一、实验目的和要求1 、掌握单片机与 DAC0832的接口设计方法 。2 、掌握 Proteus 软件与 Keil 软件的使用方法 。二、实验内容或原理1、设计一个简单的单片机应用系统，利用DAC0832输出连续周期性方波、锯齿波、三角波、正弦波信号 。三、设计要求1 、用 Proteus 软件画出电路原理图，在单片机的外部扩展片外三总线，并通过片外三总线与 0832 接口。2 、在单片机的外部扩展一个 4 个按键的键盘。3 、按下 K0，产生连续方波信号。4 、按下 K1，产生连续锯齿波信号。5 、按下 K2，产生连续三角波信号。6 、按下 K3，产生连续正弦波信号。7 、通

2、过外接示波器观察波形。四、实验报告要求1、实验目的和要求。2 、设计要求。3 、电路原理图。4 、实验程序流程框图和程序清单。5 、实验结果（波形图） 。6 、实验总结。7 、思考题。五、思考题1 、编程实现产生连续梯形波信号。ORG0000HSTART: LJMPMAINMAIN:MOVSP,#70HFUN:LCALLKEYJB20H.0,KEY0JB20H.1,KEY1JB20H.2,KEY2JB20H.3,KEY3JB20H.4,KEY4LJMPFUNKEY0: MOVDPTR,#7FFFHMOVA,#00HMOVXDPTR,ALCALLFUN1MOVA,#0FFHMOVXDPTR,AL

3、CALLFUN1LJMPKEY0KEY1: MOVDPTR,#7FFFHMOVR0,#00HLOOP: MOVA,R0MOVXDPTR,ALCALLFUN1INCR0LJMPLOOPKEY2: MOVDPTR,#7FFFHMOVR0,#01HMOVR7,#255LOOP1: MOVA,R0MOVXDPTR,ALCALLFUN1INCR0DJNZR7,LOOP1/MOVR7,#255/MOVR0,#255LOOP2: DECR0MOVA,R0MOVXDPTR,ALCALLFUN1DJNZR7,LOOP2LJMPLOOP1KEY3: MOVDPTR,#TABMOVR7,#255LOOP3: CLR

4、AMOVCA,A+DPTRPUSHDPHPUSHDPLPUSHACCMOVDPTR,#7FFFHMOVXDPTR,ALCALLFUN1POPACCPOPDPLPOPDPHINCDPTRDJNZR7,LOOP3LJMPKEY3KEY4: MOVDPTR,#7FFFHMOVR0,#01HMOVR7,#255LOOP4: MOVA,R0MOVXDPTR,ALCALLFUN1INCR0DJNZR7,LOOP4LCALLDLLOOP5: DECR0MOVA,R0MOVXDPTR,ALCALLFUN1DJNZR7,LOOP5LJMPLOOP4FUN1: LCALLKEYJB20H.0,KEY0JB20H.

5、1,KEY1JB20H.2,KEY2JB20H.3,KEY3JB20H.4,KEY4RETKEY: LCALLKEYCHULIJZEXITLCALLDLLCALLKEYCHULIJZEXITMOVB,20HKEYSF: LCALLKEYCHULIJZKEY10LCALLDLLJMPKEYSFKEY10: MOV20H,BEXIT: RETKEYCHULI: PUSHPSWCLRRS1SETBRS0MOVP1,#0FFHMOVA,P1CPLAANLA,#1FHMOV20H,ACLRRS1CLRRS0POPPSWRETDL:MOVR1,#20MOVR0,#255DL1:DJNZR0,DL1DJNZ

6、R1,DL1RETTAB:DB07FH,082H,085H,088H,08BH,08FH,092H,095H,098H,09BH,09EH,0A1H,0A4H,0A7H,0AAH,0ADHDB0B0H,0B3H,0B6H,0B8H,0BBH,0BEH,0C1H,0C3H,0C6H,0C8H,0CBH,0CDH,0D0H,0D2H,0D5H,0D7HDB0D9H,0DBH,0DDH,0E0H,0E2H,0E4H,0E5H,0E7H,0E9H,0EBH,0ECH,0EEH,0EFH,0F1H,0F2H,0F4HDB0F5H,0F6H,0F7H,0F8H,0F9H,0FAH,0FBH,0FBH,0F

7、CH,0FDH,0FDH,0FEH,0FEH,0FEH,0FEH,0FEHDB0FEH,0FEH,0FEH,0FEH,0FEH,0FEH,0FDH,0FDH,0FCH,0FBH,0FBH,0FAH,0F9H,0F8H,0F7H,0F6HDB0F5H,0F4H,0F2H,0F1H,0EFH,0EEH,0ECH,0EBH,0E9H,0E7H,0E5H,0E4H,0E2H,0E0H,0DDH,0DBHDB0D9H,0D7H,0D5H,0D2H,0D0H,0CDH,0CBH,0C8H,0C6H,0C3H,0C1H,0BEH,0BBH,0B8H,0B6H,0B3HDB0B0H,0ADH,0AAH,0A7

8、H,0A4H,0A1H,09EH,09BH,098H,095H,092H,08FH,08BH,088H,085H,082HDB07FH,07CH,079H,076H,073H,06FH,06CH,069H,066H,063H,060H,05DH,05AH,057H,054H,051HDB04EH,04BH,048H,046H,043H,040H,03DH,03BH,038H,036H,033H,031H,02EH,02CH,029H,027HDB025H,023H,021H,01EH,01CH,01AH,019H,017H,015H,013H,012H,010H,00FH,00DH,00CH,00AHDB009H,008H,007H,006H,005H,004H,003H,003H,002H,001H,001H,000H,000H,000H,000H,000HDB000H,000H,000H,000H,000H,000H,001H,001H,002H,003H,003H,004H,005H,006H,007H,008HDB009H,00AH,00CH,00DH,00FH,010H,012H,013H,015H,017H,019H,01AH,01CH,01EH,021H,023HDB025H,027H,029H,02CH,02E