Peripheral naming conventions

Every peripheral has a unique capitalized name or an abbreviation of its name, such as TIMER, that is used for identification and reference.

This name is used in chapter headings and references, and it will appear in the Arm® Cortex® Microcontroller Software Interface Standard (CMSIS) hardware abstraction layer to identify the peripheral.

When there is more than one instance of a peripheral in a power domain, a two digit number Dn is added as a suffix to the peripheral name when constructing the peripheral instance name. For example, a peripheral named PERI with instance name "PERIDn" is located in power domain D, and is instance number n in that domain. For a list of power domains, see Power domains.

The peripheral instance name is also used in the CMSIS to identify the peripheral instance.