8051???????????????????

??????????????
 40????????????????????4????????????????????I/O?????
?? ???: 
?? VCC - §à????????+5V??
?? VSS - ?????
?????????????????????????????0v????5v??????????TTL??????????????????????????????????????????????????????0v-5v?????????????????????????????????????????????????????????0v????5v???
?? ???:XTAL1??XTAL2 - ???????¡¤????????????????
?? ??????:?????????4????
 ?? ALE/PROG:???????????/???EPROM???????
    ?? ALE?????????????P0????????8¦Ë???
    ?? PROG??????????EPROM??§à?????EPROM?????????????????????‰^
  ?? PSEN:??ROM????????
  ?? RST/VPD:??¦Ë/????????
    ?? RST??Reset?????????¦Ë?????????
    ?? VPD???????Vcc???????????????????
  ?? EA/Vpp:????ROM???/???EPROM???????
    ?? EA?????????ROM?????
    ?? Vpp??????????EPROM??§à?????EPROM?????????????Vpp??
?? I/O??
 80C51????4??8¦Ë????I/O????P0??P1??P2??P3?????32???????
P3??????§Ö???????????????????????????????????????????????

????admin  ?????????2018-05-08