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28069 时钟问题

1.28069有三种时钟选择方式,内部时钟与外部时钟在低功耗方面,哪个更有优势,在选择时钟方式时,有何原则?

2.内部时钟与外部时钟的精度和可靠性哪个更好,假如采用485进行通讯,波特率设定115200,哪种时钟选择对波特率设定的精度影响较大?