English
After 5s, it returns to the first case, and the cycle repeats. Therefore, the main control circuit is required to have four states, which are set as S0, S1, S2 and S3 in turn.Chinese
5秒后，它返回到第一种情况，循环重复。因此，主控制电路需要具有四个状态，依次设置为S0、S1、S2和S3。
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