說(shuō)明下列指令中各個(gè)操作數(shù)的尋址方式。 (1)ADD A,30H (2)MOV 30H,20H (3)MOV A,@R0 (4)MOVX A,@R1 (5)SJMP $ (6)MOV R0,#20H (7)ORL C,00H (8)MOV DPTR,#2000H (9)MOVC A,@A+PC (10)ANL 20H,#30H (11)ANL C,/30H (12)CPL C (13)CPL A (14)CPL 20H (15)ADD A,@R1 (16)MOVC A,@A+DPTR (17)DJNZ R0,rel (18)SETB 00H