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Description: 可调时钟芯片，内带电池无需外部供电，初始化一次后可自行计时。-Adjustable clock chip, no external power supply with battery inside, after initializing a self-timer.
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Size: 1024 |
Author: 张同 |
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Description: 12887 电子时钟 断电计时功能基于at89c52的单片机
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Size: 10240 |
Author: 易建联 |
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