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TMS320F280037: 有关POR与BOR复位相关的疑惑

Part Number: TMS320F280037

我想问一下POR与BOR这两个复位都代表什么,我之前的理解是POR是上电复位,BOR是下电复位,但是实际上BOR还分为up与dn,所以这里我想请教一下,POR与BOR这两个复位到底是起什么作用?为什么设计这两个复位?