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About this book

This book is a generic user guide for devices that implement the ARM Cortex-M0 processor. Implementers of Cortex-M0 designs make a number of implementation choices, that can affect the functionality of the device. This means that, in this book:

  • some information is described as implementation-defined

  • some features are described as optional.

See the documentation from the supplier of your Cortex-M0 device for more information about these features.

In this book, unless the context indicates otherwise:


Refers to the Cortex-M0 processor, as supplied by ARM.


Refers to an implemented device, supplied by an ARM partner, that incorporates a Cortex-M0 processor. In particular, your device refers to the particular implementation of the Cortex-M0 that you are using. Some features of your device depend on the implementation choices made by the ARM partner that made the device.