( 6 )已知片内 RAM 中, (30H)=38H , (38H)=40H , (40H)=48H , (48H)=90H 。请分析下面指令,说明源操作数的寻址方式以及按顺序执行每条指令的结果。(填:直接寻址或间接寻址等,以及数据) MOV A , 40H ( ) ( ) MOV R0 , A ( ) ( ) MOV P1 , #F0H ( ) ( ) MOV @R0 , 30H ( ) ( ) MOV DPTR , #3848H ( ) ( ) MOV 40H , 38H ( ) ( ) MOV R0 , 30H ( ) ( ) MOV P0 , R0 ( ) ( ) MOV 18H , #30H ( ) ( ) MOV A , @R0 ( ) ( ) MOV P2 , P1 ( ) ( )