要求如题:做倒计时时钟,要求掉电时用CR2032电池能保持时钟正常计数,上电时读取RAM能准确显示倒计时的天(百位),时,分,秒。10个IO即可,没其它需求!谢谢!
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要求如题:做倒计时时钟,要求掉电时用CR2032电池能保持时钟正常计数,上电时读取RAM能准确显示倒计时的天(百位),时,分,秒。10个IO即可,没其它需求!谢谢!