软件使用主时钟和RTC, backup电池掉电了也能跑！ HT1381/DS1302 RTC， 7-SEG管为共阴， 软件中SEG为负逻辑，COM为正逻辑以便驱动三极管作高亮度显示。

Packet : 4digi-ledrtc01.rar filelist
4digi-ledrtc01.c

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