00-59 seconds timer (using software delay) with the production of binary files. In the Proteus and keil adopted under the joint debugging.

CH4-11\AT89C51单片机实践系统板.DSN
......\AT89C51单片机实践系统板.PWI
......\CH4-11
......\CH4-11.C
......\CH4-11.hex
......\CH4-11.lnp
......\CH4-11.LST
......\CH4-11.M51
......\CH4-11.OBJ
......\CH4-11.Opt
......\CH4-11.plg
......\CH4-11.Uv2
......\CH4-11.__i
......\CH4-11_Opt.Bak
......\CH4-11_Uv2.Bak
......\STARTUP.A51
......\STARTUP.LST
......\STARTUP.OBJ
CH4-11

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