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如何保证代码的安全性?



各位好,据我所知,28系列的可以通过设置芯片FLASH上的密码,但是这样还是可以读回代码的?还有一种方式,烧录完*out文件后,拔掉JTAG,下次上电则无法再次连接,不知道这是怎么实现的?哪位大虾,知道的烦请告知。