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C6455如何用串口下载调试程序

以前都挂仿真器的,刚被告知不能开盖,只留几个串口引脚给我们改,现在板子得重新处理,DSP这块要求通过串口RS232/422进行程序调试、下载,该如何解决呢?

 

顺便问一句,C6455里面是否可用加入看门狗,一旦程序跑飞,马上复位!
PC指针在跑飞的时候总是往一个固定地址去进行无限循环的NOP,能否加入某段代码,当PC指令跳转到某处时,跳转至程序的某一段?