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LAUNCHXL-F280049C: 求教:实测运行速度慢一倍,请问如何解决?

Part Number: LAUNCHXL-F280049C

用的是launchpad,测试发现运行速度过慢。经测试20M晶振波形OK,读系统时钟也是100M。后用IO测试时间,测试了100个NOP指令,实测为2us。按照100M计算应该是1us啊,请教高手如何解决啊?