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- 利用计数的方式测32.768KHZ和555振荡器频率的设计; 用LCD液晶显示,用按键控制闸门时间,分别设定为0.1s,1s,10s -Using counting methods and 555 test 32.768KHZ oscillator frequency design with LCD liquid crystal display, with keys controlled gate time, were set to 0.1s, 1s, 10s