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DS90UB954，规格书P149描述需要一个3ms左右的复位
而P151没有此要求
现在问题是，到底要不要在PDB拉高后，再拉低3ms，做一个硬件复位
明白，只有需要复位时才拉低PDB；按Figure 57的上电时序配置就ok
