单片机AT89C51电子琴设计的原理图和c程序???答:include <AT89X51.H> unsigned char temp;unsigned char key;unsigned char i,j;unsigned char STH0;unsigned char STL0;unsigned int code tab[]={64021,64103,64260,64400,64524,64580,64684,64777,64820,64898,64968,65030,65058,65110,65157,65178};void main(void){ TMOD=0x01;ET0=1;EA=...
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:LOOP3:JB P0.3,LOOP4 MOV A,R1 ADD A,#6 MOVC A,@A+DPTR MOV T0H,A INC DPTR MOV A,R1 ADD A,#6 MOVC A,@A+DPTR MOV T0L,A LJMP LOOP LOOP4:JB P0.4,LOOP5 MOV A,R1 ADD A,#8 MOVC A,@A+DPTR MOV T0H,A INC DPTR MOV A,R1 ADD A,#8 MOVC A,@A+DPTR ...