微控制器第七次實驗課 A D 和 D A 實驗

（1）完成 a/d 介面設計，採用查詢方式和中斷方式編寫程式。

（2）實現 d/a 介面設計，編寫程式輸出方波、鋸齒波、正弦波，使用示波器觀察波形。

實驗室裡只用做第二個

鋸齒波彙編：

（此處沒設延時，如果設延時則一定不要設太大，不然波形會變形）

org 0000h mov a,#00h back: mov dptr,#8140h movx @dptr,a mov dptr,#81c0h movx @dptr,a inc a sjmp back

end

鋸齒波c語言：

#include#includeunsigned char a=0;
main()
}

方波彙編：

org 0000h mov a,#00h back: mov dptr,#8140h movx @dptr,a mov dptr,#81c0h movx @dptr,a cpl a call delay sjmp back delay: mov r7,#17h dl1: mov r6,#98h dl0: mov r5,#46h djnz r5,$ djnz r6,dl0 djnz r7,dl1

retend

方波c語言：

#include#includeunsigned char a=0;
void delay500ms(void)
main()
}

正弦波彙編（查表）：

mov 0000h ng1:mov r0,#00h ng2:mov a,r0 mov dptr,#tab1 movc a,@a+dptr mov dptr,#8140h movx @dptr,a mov dptr,#81c0h movx @dptr,a inc r0 acall dalay ajmp ng2 tab1:db 80h,83h,86h,89h,8dh,90h,93h,96h,99h,9ch,9fh,0a2h,0a5h,0a8h,0abh,0aeh tab2:db 0b1h,0b4h,0b7h,0bah,0bch,0bfh,0c2h,0c5h,0c7h,0cah,0cch,0cfh,0d1h,0d4h,0d6h,0d8h tab3:db 0dah,0ddh,0dfh,0e1h,0e3h,0e5h,0e7h,0e9h,0eah,0ech,0eeh,0efh,0f1h,0f2h,0f4h,0f5h tab4:db 0f6h,0f7h,0f8h,0f9h,0fah,0fbh,0fch,0fdh,0fdh,0feh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh tab5:db 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0feh,0fdh,0fdh,0fch,0fbh,0fah,0f9h,0f8h,0f7h,0f6h tab6:db 0f5h,0f4h,0f2h,0f1h,0efh,0eeh,0ech,0eah,0e9h,0e7h,0e5h,0e3h,0e1h,0dfh,0ddh,0dah tab7:db 0d8h,0d6h,0d4h,0d1h,0cfh,0cch,0cah,0c7h,0c5h,0c2h,0bfh,0bdh,0bah,0b7h,0b4h,0b1h tab8:db 0aeh,0abh,0a8h,0a5h,0a2h,9fh,9ch,99h,96h,93h,90h,8dh,89h,86h,83h,80h tab9:db 80h,7ch,79h,76h,72h,6fh,6ch,69h,66h,63h,60h,5dh,5ah,57h,55h,51h tab10:db 4eh,4ch,48h,45h,43h,40h,3dh,3ah,38h,35h,33h,30h,2eh,2bh,29h,27h tab11:db 25h,22h,20h,1eh,1ch,1ah,18h,16h,15h,13h,11h,10h,0eh,0dh,0bh,0ah tab12:db 09h,08h,07h,06h,05h,04h,03h,02h,02h,01h,00h,00h,00h,00h,00h,00h tab13:db 00h,00h,00h,00h,00h,00h,01h,02h,02h,03h,04h,05h,06h,07h,08h,09h tab14:db 0ah,0bh,0dh,0eh,10h,11h,13h,15h,16h,18h,1ah,1ch,1eh,20h,22h,25h tab15:db 27h,29h,2bh,2eh,30h,33h,35h,38h,3ah,3dh,40h,43h,45h,48h,4ch,4eh tab16:db 51h,55h,57h,5ah,5dh,60h,63h,66h,69h,6ch,6fh,72h,76h,79h,7ch,7eh dalay:mov r1,#10h dalay1:djnz r1,$

retend

正弦波c語言：

#include#include#include#define pi acos(-1)
main()
}

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