请看下面手册上的话
For some system critical features it is possible to program a fuse to disable all changes in the
associated I/O control registers. If this is done, it will not be possible to change the registers from the user software, and the fuse can only be reprogrammed using an external programmer. Details on this are described in the data sheet module where this feature is available.
fuse修改了rst管脚功能后,只能用外部烧写器改回来,应用程序是不能修改的,自己搞个外部ISP功能的烧写器重烧吧
西尔特的编程器可以烧录ATXMEGA系列,自己看下吧 http://www.xeltek.com.cn/
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