About this document

This product specification is organized into chapters based on the modules and peripherals that are available in this IC.

The peripheral descriptions are divided into separate sections that include the following information:

Document naming and status

Nordic uses three distinct names for this document, which are reflecting the maturity and the status of the document and its content.

Table 1. Defined document names
Document name Description
Objective Product Specification (OPS)

Applies to document versions up to 0.7.

This product specification contains target specifications for product development.

Preliminary Product Specification (PPS)

Applies to document versions 0.7 and up to 1.0.

This product specification contains preliminary data. Supplementary data may be published from Nordic Semiconductor ASA later.

Product Specification (PS)

Applies to document versions 1.0 and higher.

This product specification contains final product specifications. Nordic Semiconductor ASA reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.

Peripheral naming and abbreviations

Every peripheral has a unique capitalized name or an abbreviation of its name, e.g. TIMER, 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.

The peripheral instance name, which is different from the peripheral name, is constructed using the peripheral name followed by a numbered postfix, starting with 0, for example, TIMER0. A postfix is normally only used if a peripheral can be instantiated more than once. The peripheral instance name is also used in the CMSIS to identify the peripheral instance.

Register tables

Individual registers are described using register tables. These tables are built up of two sections. The first three colored rows describe the position and size of the different fields in the register. The following rows describe the fields in more detail.

Fields and values

The Id (Field Id) row specifies the bits that belong to the different fields in the register. If a field has enumerated values, then every value will be identified with a unique value id in the Value Id column.

A blank space means that the field is reserved and read as undefined, and it also must be written as 0 to secure forward compatibility. If a register is divided into more than one field, a unique field name is specified for each field in the Field column. The Value Id may be omitted in the single-bit bit fields when values can be substituted with a Boolean type enumerator range, e.g. true/false, disable(d)/enable(d), on/off, and so on.

Values are usually provided as decimal or hexadecimal. Hexadecimal values have a 0x prefix, decimal values have no prefix.

The Value column can be populated in the following ways:

  • Individual enumerated values, for example 1, 3, 9.
  • Range of values, e.g. [0..4], indicating all values from and including 0 and 4.
  • Implicit values. If no values are indicated in the Value column, all bit combinations are supported, or alternatively the field's translation and limitations are described in the text instead.

If two or more fields are closely related, the Value Id, Value, and Description may be omitted for all but the first field. Subsequent fields will indicate inheritance with '..'.

A feature marked Deprecated should not be used for new designs.


Table 2. Register Overview
Register Offset Description
DUMMY 0x514

Example of a register controlling a dummy feature



Address offset: 0x514

Example of a register controlling a dummy feature

Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Id     D D D D           C C C               B             A A
Reset 0x00050002 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
Id RW Field Value Id Value Description



Example of a field with several enumerated values




The example feature is disabled




The example feature is enabled in normal mode




The example feature is enabled along with extra functionality




Example of a deprecated field





The override feature is disabled




The override feature is enabled




Example of a field with a valid range of values




Example of allowed values for this field




Example of a field with no restriction on the values


Documentation feedback | Developer Zone | Updated 2021-11-08