單片機編程綜合題:編程將片外RAM2000H起始的連續256字節數拷貝到4000h起始的單元中

MOV DPTR,#2000H

MOV R7,#0

LOOP:

MOVX A,@DPTR

PUSH ACC

MOV A,DPH

ADD A,#20H

MOV DPH,A

POP ACC

MOVX @DPTR,A

MOV A,DPH

CLR C

SUBB A,#20H

MOV DPH,A

INC DPTR

DJNZ R7,LOOP

SJMP $

END