23.数码管显示电子时钟\DZ .....................\DZ.c .....................\DZ.hex .....................\DZ.LST .....................\DZ.M51 .....................\DZ.OBJ .....................\DZ.Opt .....................\DZ.plg .....................\DZ.Uv2 .....................\STARTUP.A51 .....................\STARTUP.lst .....................\STARTUP.obj 23.数码管显示电子时钟