单片机的程序分析题 请给出答案,谢谢答:1.MOV A,R0 MOV R1,R1 2.MOV 21H,20H 3.MOV A,30H RR A RR A MOV 30H,A 4.MOV A,40H CPL A MOV 40H,A 5.PUSH B 6.MOV DPTR,#3000H MOVX A,@DPTR MOV R0,A 7.CLR A MOV DPTR,4000H MOVC A,@A+DPTR MOV R1,A 8.MOV A,R3 ADD A,R4 MOV R3,A 9.CLR C SUBB ...