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使用28069总烧坏JATG口



最近使用28069发现总烧坏JATG口,怎么回事?用JATG口编程有什么要注意的吗?还是28069的抗干扰能力有问题?但芯片中原来烧写好的程序还能运行,只是不能再编程了