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一般来说NOP是占用1个时钟周期。
Some cores have a 1:1 relationship between the clock and the CPU cycles, therefore a simple instruction like NOP located in internal memory should just jump one unit in the counter. However, if the code is located in external memory the CPU will have to wait several cycles until the instruction is fetched to its internal pipeline (caused by waitstates and stalls), this translates to additional clock cycles measured by the Profile clock. software-dl.ti.com/.../ccsv7_counting_cycles.html
这个帖子也可以看一下。 e2e.ti.com/.../1175126
要准确延时可以用timer。
