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LPC29xx Microcontrollers Slide 3
Tightly coupled memory (TCM) is a low-latency memory that provides predictable performance, and whose accesses are deterministic and do not access the AHB (Advanced High Performance Bus). Due to its deterministic behavior, the TCM can hold critical routines, such as interrupt handling routines or real-time tasks where the indeterminacy of a cache is highly undesirable. Also, the TCMs can easily be controlled by a small footprint embedded OS. Cache requires a much larger OS to manage it efficiently, and is not predictable.
PTM Published on: 2011-11-02