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TMS320F28335: 函数运行TMS320F28335开销是TMS320F28377D的十倍?这个正常吗?

Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

Dear 各位大佬,

RT,同样一个函数,我在28377D的平台下测试开销30us左右,然而在28335的平台下测试开销300多us,请问一下这是正常的现象吗?28335的主频设置的150MHZ,28377D的主频设置的200MHZ,差距怎么会这么大呢?