89C51???????????????
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1?? ???????????????????????????????5V???????????????40?????????(??)??20?????
2?? ?????·????????????????·????????????????????????????????????????????????????????????????18??19???????????????????????????????1??????ɡ?
3?? ??λ????????1?л?????????????λ??κ??弰???????????λ?????????????н????
4?? EA?????EA?????????????? ?????????????????????磬????????????????
????????80C51????????????????????
????admin ?????????2018-05-18
