With the c language of the digital clock, sometimes minutes and seconds display, and when the minutes and seconds are adjustable, error smaller. AT89C51 microcontroller with digital tube display, the program using keil write, experimental simulation has protel99se implementation, has been successfully verified

实验二十数字时钟\STARTUP.A51
................\Led20keil.plg
................\Led20.c
................\STARTUP.lst
................\Led20keil.M51
................\Led20keil.hex
................\Led20.PWI
................\STARTUP.obj
................\Led20.LST
................\Led20.OBJ
................\Led20keil
................\Last Loaded Led20.DBK
................\Led20.dsn
................\Led20keil_Uv2.Bak
................\Led20keil.Uv2
................\Led20keil_Opt.Bak
................\Led20keil.Opt
实验二十数字时钟

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