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EK-LM4F120XL BEBUG的问题

Other Parts Discussed in Thread: TM4C1233H6PM

最近在用LM4F120XL 这块评估板做实验,上面芯片已换成TM4C1233H6PM发现一个问题,描述如下:

Win7 64位操作系统,IAR使用版本7.3,Debug选择的Ti自带的ICDI调试工具TI Stellaris,用的tiva自带的例程

download and debug后直接跑飞点(暂停后如下图),重新上电也不能正常运行。但用LM FLASH Progarmmer可以正常下载运行。

因为需要单步调试,需要解决这个问题,请问这是什么原因引起的?该如何解决?非常感谢!