51 single-chip system with the smallest C-language program, which has a digital display, keypad scanning, and a clock procedures for entry to use for beginners.

C51_System
..........\inter.c
..........\inter.LST
..........\inter.OBJ
..........\main.c
..........\main.h
..........\main.LST
..........\main.OBJ
..........\mp3play
..........\mp3play.CON
..........\mp3play.hex
..........\mp3play.lnp
..........\mp3play.M51
..........\mp3play.Opt
..........\mp3play.plg
..........\mp3play.Uv2
..........\mp3play_Opt.Bak
..........\mp3play_Uv2.Bak
..........\panel.c
..........\panel.LST
..........\panel.OBJ
..........\sub.c
..........\sub.LST
..........\sub.OBJ

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