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MSP430F5438A关于Boot跳转App的问题

bootloader通过串口在线更新程序。。boot程序中串口初始化是用smclk115200波特率,app程序中串口用aclk9600波特率初始化,app程序中的串口无法工作(boot和app用的是同一个串口),但是能跳转到app程序,而且运行正常,其它功能也都正常(包括另外几个用alck9600的串口)。我发现,把app程序的串口初始化改为smclk波特率9600,跳转以后串口就能正常收发了。。为什么啊啊啊