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F2812上电后偶尔不能启动



设计了一个电路,但是上电后DSP有时可以启动,有时启不来,后来把电路中R48的阻值换成5.1K就没问题了,电路图见附件,这部分是SCI模拟的485通信。想知道什么原因,求大神解释,谢谢啦!