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TM4C123GXL用keil5加载程序时出现



could not initialize the target device.please power cycle  the board and try again!昨天还能用,一晚上过去后就不行了,

然后在LM FLASH Programmer工具中,选择ICDI ,设计JTAG ,1OOK,在第三栏中FLASH Utlities中点击Erase擦除Flash,出现

**error**:unable to initialize target_0!

请问这是什么情况