51 microcontroller io port expansion experiments, 8255a chip microcontroller io port 51 extend inside with proteus simulation schematic drawing and keil c source code, to facilitate learning

8255a extend of 51\io扩展8255a.DSN
..................\io扩展8255a.PWI
..................\Last Loaded io扩展8255a.DBK
..................\代码\io口扩展8255a
..................\....\io口扩展8255a.hex
..................\....\io口扩展8255a.lnp
..................\....\io口扩展8255a.M51
..................\....\io口扩展8255a.plg
..................\....\io口扩展8255a.uvopt
..................\....\io口扩展8255a.uvproj
..................\....\io口扩展8255a_uvproj.bak
..................\....\main.c
..................\....\main.LST
..................\....\main.OBJ
..................\....\main.__i
..................\....\STARTUP.A51
..................\....\STARTUP.LST
..................\....\STARTUP.OBJ
..................\....\动态数码管显示.uvopt
..................\....\动态数码管显示_uvproj.bak
..................\代码
8255a extend of 51

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