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急!在线等,tm4c 1233 mcu 利用JTAG下载不了程序,显示没连接设备。

如图所示为tm4c 1233电路设计时JTAG的引脚出线口,电源管脚都没有连接错,供电正常,内核电压输出有1.2V,RC复位电路也没有错,为何程序无法下载呢?