MCS-51???????P0??P3????кβ????
MCS-51???????P0??P3????кβ??????????I/O??????????????????
??: P2????????????????????I/O??????????????????????洢????????8λ????????????λ??????2-11?????????2-10?????P1????????????????????????P1???????????P1??????????·?л?????MUX???????3??P3?????????????????λ??????2-12????P1???????????????P3????P1????????????“?????”3???????4????????????????????P3????????P1???????I/O????????????????????????????е??2?????P0?????·???????(???/????)??????????????·(??????3??????4)????·????л?????MUX?????????C??????????????軻?????Ч???T1??????????????????????????????I/O????????????????????MOV Pi,#0FFH????????дFFH????????Ч???T?????????????????
????admin ?????????2018-05-18
