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对于Cortex-m内核而言，ITM总线和ETM总线有什么区别？

HuaChen陈

谁能简要地介绍下！

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    ITM = Instrument Trace Macrocell

    ETM = Embedded Trace Macrocell

    二者都是用来产生trace数据的。它们的输出格式都是ATB bus。

    二者的区别是：ETM可以用来trace CPU的指令和数据访问，且内部有控制逻辑来实现enable，filter，event trigger等功能。ITM主要通过CPU写内部寄存器来产生trace。