????8031??????????????????????
????????http://zhidao.baidu.com/question/132136276.html
???????????P1?????????????????????????
???????????????????????????????????
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???????????????????4KB?????洢????
??????80 - ??????2010-1-7 14:43
=====================================
?????
;------------------------------------
;??????????????洢?????????P0P2?????????????????????P1???8??LED????P3.2????“????”????
;???????????????.
;------------------------------------
ORG 0000H ;????????.
SJMP MAIN ;?????MAIN.
ORG 0030H ;???????.
MAIN:
MOV 30H, #7FH ;?趨???淢???????
MOV 31H, #55H ;?趨?????????????
;------------------------------------
LOOP1:
MOV A, 30H ;???????????
LOOP11:
RL A ;???
MOV P1, A ;???
LCALL DELAY ;????????
JNB P3.2, LOOP2 ;???????????????
SJMP LOOP11 ;???
;------------------------------------
LOOP2:
MOV A, 31H ;???????????
LOOP22:
CPL A
MOV P1, A
LCALL DELAY
JB P3.2, LOOP1 ;???????棬?????
SJMP LOOP22
;------------------------------------
DELAY: ;??????????????????
MOV R7, #250
DL1:MOV R6, #100
DL2:MOV R5, #10
DL3:DJNZ R5, DL3
DJNZ R6, DL2
DJNZ R7, DL1
RET
END
????admin ?????????2018-05-18
