用八个按钮控制p1端口使电子琴发出do,re,mi,fa,so,la,si,deo(用单片机...答:MOV A,R1 ADD A,#8 MOVC A,@A+DPTR
单片机简易程序, 电子琴 内附图 有说明答:LJMP START ORG 000BH LJMP TIMER START:CLR TR0 MOV SP,#70H MOV TMOD,#01H MOV IE,#82H MOV P0,#0FFH XUANZ:MOV A,P2 CJNE A,#0FFH,BOFANG KEY:MOV R0,#00H JB P1.0,KEY1 LJMP KEYIN KEY1:INC R0 JB P1.1,KEY2 LJMP KEYIN KEY2:INC R0 JB P1.2,KEY3 LJMP KEYIN...