80C51??????????????
MCS-51??????40????????????????·о?????????????μ??
P0.0 ?? P0.7?? P0??8λ???????
P1.0 ?? P1.7 ??P1??8λ???????
P2.0 ?? P2.7 ??P2??8λ???????
P3.0 ?? P3.7 ??P3??8λ???????
?? ALE??????????????????????????ALE????????P0????????8λ???????????????????λ?????????????????????ALE???????1/6?????????????????壬???,??????????????????????á?
?? PSEN????????洢???????????????ROM???PSEN??Ч?????????????????ROM????????????
?? EA?????????洢???????????????????????ROM??????????????????洢???????????????????ROM?????????????????洢?????????????????????洢????
?? RST????λ????????????λ?????????????????????????????????Ч????????????????λ???????????
?? XTAL1??XTAL2???????????????????о???????????????????????????????????????????????????????????????????????
?? VSS???????
?? VCC??+5 V?????
?? ??????MCS-51?????о?40?????????弰????????????????????????·??????????????·?в???????????????á?
?? P3????????????P3??8????????????е???????
????admin ?????????2018-06-27
