将外部数据存储单元的内容传送到累加器A中的指令是:
A. MOVXA,@R0
B. MOVDPTR,
C. data16
D. MOVA,@R0
E. MOVCA,@A+DPTR
指令MOVR0,#20H执行前(R0)=30H,(20H)=38H,执行后(20H)为:
A. 00H
B. 20H
C. 30H
D. 38H
指令MOVR0,#20H执行前(R0)=30H,(20H)=38H,执行后(R0)为:
A. 00H
B. 20H
C. 30H
D. 38H
下列完成8051单片机内部数据传送的指令是:
A. MOVXA,@DPTR
B. MOVCA,@A+PC
C. MOVA,
D. data
E. MOVdirect,direct