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刚上手430，现需要通过定时器使一个IO口输出5s的低电平，再输出25ms的高电平。这样是否需要用到PWM输出？能给个例子参考一下吗？
因为周期比较长，建议使用定时器定时来操作IO.
定时周期25ms，并设置一个变量来计数，当够5s了改变IO电平状态。然后一个定时器周期后，再改回来
