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- 用定时器 3来改变小灯的状态,T3每发生 200次中断小灯改变状态一次。1 个 LED灯常亮, 1 个 LED灯闪烁。 -3 with a timer to change the status of small lights, T3 occurred 200 times for every little light to change the status of an interrupt. 1 LED lights lit, an LED flashes.