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F28027F 上电程序跑飞

做BLDC,3.3V是单独供电,采用自举电路,12V供电。不上12V时候,程序可以运行,led能正常闪灭,一上12V程序好像跑飞,仿真也是就终止了仿真模式。想问问大概是什么情况。