51????????????
???51??????????
???????????
??????????2????
VCC(Pin40)????????????5V???
GND(Pin20)???????
2?????????????2????
XTAL1(Pin19)????????·???????
XTAL2(Pin20)????????·???????
3???????????4????
RST/VPP(Pin9)????λ??????????????2????????????????????????λ??
ALE/PROG(Pin30)????????????????
PSEN(Pin29)?????洢?????????
EA/VPP(Pin31)??????洢?????????????????????????洢?????????????????????????洢??????䶮
4??????????/????????32????
51???????4??8λ?????I/O???????P0??P1??P2??P3??????????8λ??8???????????32????
PO???Pin39??Pin32????8λ???I/O??????????P0.0??P0.7??
P1???Pin1??Pin8?? ??8λ????I/O??????????P1.0??P1.7??
P2???Pin21??Pin28????8λ????I/O??????????P2.0??P2.7 ??
P3???Pin10??Pin17????8λ????I/O??????????P3.0??P3.7??
????simon ?????????2019-07-15
