50MHz的晶振频率，可以产生50MHz的计数器。每个计数周期代表20ns。 每毫秒产生一个写脉冲，意味着20000个时钟为一个大循环，换成二进制，需要15位的计数器，计到19999强制归零。 不可能产生30ms的准确写宽度，最小只能用两个

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利用计数器控制状态变更产生周期性写时序.ppt

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