89S52 designed using an electronic clock, C51 preparation, in this case did not use 1302 clock chip, etc., but in this case complete with a clock chip functions. For example the basic date, time, and every second week of features, but also the number of days flat leap automatic compensation. As a result of the full software algorithms, the clock error of greater use of high-quality crystal can reduce the error. In this case focuses on training and training for beginners to learn on the C51.

89s52_rtc
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.........\题目2_时钟.c
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.........\题目2_时钟.lnp
.........\题目2_时钟.LST
.........\题目2_时钟.M51
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.........\题目2_时钟.Opt
.........\题目2_时钟.plg
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.........\题目2_时钟11111.LST
.........\题目2_时钟11111.OBJ
.........\题目2_时钟_Opt.Bak
.........\题目2_时钟_Uv2.Bak

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