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请教28069在线升级方法、程序示例、相关资料

如题,想用一个外部MCU对28069进行程序升级,求大神赐教方案,程序示例,或相关资料。

另可不可以外部MCU通过TDI,TDO,XRS,GPIO34四个端口实现对28069的在线升级。

谢谢!