Some exercise of 89C51, such as AD-DA, RS232, LCD1602, I2C bus and so on.

Keil uVision的保存\AD_DA转换\练习1（AD_DA转换，数码管显示AD转换结果）\exercise_1
..................\.........\........................................\exercise_1.c
..................\.........\........................................\exercise_1.hex
..................\.........\........................................\exercise_1.lnp
..................\.........\........................................\exercise_1.LST
..................\.........\........................................\exercise_1.M51
..................\.........\........................................\exercise_1.OBJ
..................\.........\........................................\exercise_1.Opt
..................\.........\........................................\exercise_1.plg
..................\.........\........................................\exercise_1.Uv2
..................\.........\........................................\exercise_1_Opt.Bak
..................\.........\........................................\exercise_1_Uv2.Bak
..................\.........\........................................\I2C.c
..................\.........\........................................\I2C.h
..................\.........\........................................\I2C.LST
..................\.........\........................................\I2C.OBJ
..................\.........\....2（AD_DA转换自己编写）\exercise_2
..................\.........\..........................\exercise_2.c
..................\.........\..........................\exercise_2.hex
..................\.........\..........................\exercise_2.lnp
..................\.........\..........................\exercise_2.LST
..................\.........\..........................\exercise_2.M51
..................\.........\..........................\exercise_2.OBJ
..................\.........\..........................\exercise_2.Opt
..................\.........\..........................\exercise_2.plg
..................\.........\..........................\exercise_2.Uv2
..................\.........\..........................\exercise_2_Opt.Bak
..................\.........\..........................\exercise_2_Uv2.Bak
..................\.........\..........................\I2C.c
..................\.........\..........................\I2C.h
..................\.........\..........................\I2C.LST
..................\.........\..........................\I2C.OBJ
..................\I2C总线\AT24C02控制8为数码管（动态显示0~7）\exercise_2
..................\.......\...................................\exercise_2.c
..................\.......\...................................\exercise_2.hex
..................\.......\...................................\exercise_2.lnp
..................\.......\...................................\exercise_2.LST
..................\.......\...................................\exercise_2.M51
..................\.......\...................................\exercise_2.OBJ
..................\.......\...................................\exercise_2.Opt
..................\.......\...................................\exercise_2.plg
..................\.......\...................................\exercise_2.Uv2
..................\.......\...................................\exercise_2_Opt.Bak
..................\.......\...................................\exercise_2_Uv2.Bak
..................\.......\...................................\I2C.C
..................\.......\...................................\I2C.H
..................\.......\...................................\I2C.LST
..................\.......\...................................\I2C.OBJ
..................\.......\.............皇

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