来源：PM0214 Rev 10，Page 12

# About this document

This document provides the information required for application and system-level software development. It does not provide information on debug components, features, or operation.

This material is for microcontroller software and hardware engineers, including those who have no experience of Arm products.

This document applies to Arm®(a)-based devices.

## 1.1 Typographical conventions

The typographical conventions used in this document are:

## 1.2 List of abbreviations for registers

The following abbreviations are used in register descriptions:

| Abbreviation | Meaning |
|--------------|---------|
| read/write (rw) | Software can read and write to these bits. |
| read-only (r) | Software can only read these bits. |
| write-only (w) | Software can only write to this bit. Reading the bit returns the reset value. |

**Typographical conventions:**

| Style | Meaning |
|-------|---------|
| *italic* | Highlights important notes, introduces special terminology, denotes internal cross-references, and citations. |
| `<` and `>` | Enclose replaceable terms for assembler syntax where they appear in code or code fragments. For example: `LDRSB<cond> <Rt>, [<Rn>, #<offset>]` |
| **bold** | Highlights interface elements, such as menu names. Denotes signal names. Also used for terms in descriptive lists, where appropriate. |
| `monospace` | Denotes text that you can enter at the keyboard, such as commands, file and program names, and source code. |
| `monospace` (underlined) | Denotes a permitted abbreviation for a command or option. You can enter the underlined text instead of the full command or option name. |
| *monospace italic* | Denotes arguments to monospace text where the argument is to be replaced by a specific value. |
| **`monospace bold`** | Denotes language keywords when used outside example code. |

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