1602时钟实验
............\lesson9
............\lesson9.c
............\lesson9.hex
............\lesson9.lnp
............\lesson9.LST
............\lesson9.M51
............\lesson9.OBJ
............\lesson9.Opt
............\lesson9.plg
............\lesson9.Uv2
............\lesson9.__i
............\lesson9_Opt.Bak
............\lesson9_Uv2.Bak
............\STARTUP.A51
............\STARTUP.LST
............\STARTUP.OBJ