ORG 0000H
PORTA EQU 7F01H
PORTB EQU 7F02H
CADDR EQU 7F00H
MOV A,#01H
MOV DPTR,#CADDR
MOVX @DPTR,A
DONE:MOV DPTR,#PORTB
MOV A,#0F0H
MOVX @DPTR,A
MOVX A,@DPTR
CJNE A,#0F0H,NEXT1
AJMP DONE
......
这样写对吗?
恩,操作上没错