This document is organized into chapters that are based on the modules and peripherals available in the IC.
The document status reflects the level of maturity of the document.
Document name | Description |
---|---|
Objective Product Specification (OPS) |
Applies to document versions up to 1.0. This document contains target specifications for product development. |
Product Specification (PS) |
Applies to document versions 1.0 and higher. This document 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. |
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.
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:
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.
Different fields in a register might have different access permissions enforced by hardware.
The access permission for each register field is documented in the Access column in the following ways:
Access | Description | Hardware behavior |
---|---|---|
RO | Read-only | Field can only be read. A write will be ignored. |
WO | Write-only | Field can only be written. A read will return an undefined value. |
RW | Read-write | Field can be read and written multiple times. |
W1 | Write-once | Field can only be written once per reset. Any subsequent write will be ignored. A read will return an undefined value. |
RW1 | Read-write-once | Field can be read multiple times, but only written once per reset. Any subsequent write will be ignored. |
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 | R/W | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A |
RW |
FIELD_A |
Example of a read-write field with several enumerated values |
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Disabled |
0 |
The example feature is disabled |
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NormalMode |
1 |
The example feature is enabled in normal mode |
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ExtendedMode |
2 |
The example feature is enabled along with extra functionality |
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B |
RW |
FIELD_B |
Example of a deprecated read-write field This field is deprecated. |
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Disabled |
0 |
The override feature is disabled |
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Enabled |
1 |
The override feature is enabled |
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C |
RW |
FIELD_C |
Example of a read-write field with a valid range of values |
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ValidRange |
[2..7] |
Example of allowed values for this field |
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D |
RW |
FIELD_D |
Example of a read-write field with no restriction on the values |