ex5104.asm

DVCC-jh+ c51单片机试验操作程序源代码（键盘实验 二极管等）

        ORG 0000H
BEGIN:  LJMP START
        ;
        ORG 0013H
        LJMP INT_P
        ;
        ORG 0030H
START:  MOV P1,#0FFH
        SETB IT1
        MOV A,#01H
        MOV IE,#10000100B
LOOP:   MOV DPTR,#0B000H
        MOVX @DPTR,A
        INC A
        MOV R6,#0FFH
DE1:    MOV R7,#0FFH
DE2:    DJNZ R7,DE2
        DJNZ R6,DE1
        SJMP LOOP
        ;
INT_P:  MOV A,P1
        RETI
        ;
        END