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TMS570LC4357: 烧录时出现报错

Part Number: TMS570LC4357

使用ccs下载程序时,调试器使用的是XDS200,出现下面 的错误:Error connecting to the target: (Error -241 @ 0x0) A router subpath could not be accessed. A security error has probably occurred. Make sure your device is unlocked. (Emulation package 20.0.0.3178),经测试晶振时钟是10MHz,没有问题,请问这是什么原因呢?