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TMS320F2812的电源上电时序

1.2812 的datasheet上说:“上电顺序主要是为了确保模块正常的复位” 是什么含义,请详细解释下。

2.如果不按照先上3.3v再上1.8v的顺序是不是影响芯片寿命?datasheet上面没说,请问是否会影响芯片的寿命。谢谢