NRF52810-QCAA-R7 datasheet(287/483 Pages) NORDIC

287 / 483 page

Peripherals

• Least significant byte first for the fields ADDRESS and PAYLOAD. The ADDRESS fields are also always

transmitted and received least significant bit first on-air.

• Most significant byte first for the CRC field. The CRC field is also always transmitted and received most

significant bit first.

The bit endianness, i.e. the order in which the bits are sent and received, is configured in PCNF1.ENDIAN

for the fields S0, LENGTH, S1 and PAYLOAD.

The sizes of the fields S0, LENGTH and S1 can be individually configured in the S0LEN, LFLEN and S1LEN

fields of the PCNF0 register respectively. If any of these fields are configured to be less than 8 bit long, the

least significant bits of the fields are used, as seen from the RAM representation.

If S0, LENGTH or S1 are specified with zero length, their fields will be omitted in memory. Otherwise each

field will be represented as a separate byte, regardless of the number of bits in their on-air counterpart.

6.14.3 Maximum packet length

Independent of the configuration of MAXLEN, the combined length of S0, LENGTH, S1 and PAYLOAD

cannot exceed 258 bytes.

6.14.4 Address configuration

The on-air radio ADDRESS field is composed of two parts, the base address field and the address prefix

field.

The size of the base address field is configurable via BALEN in PCNF1. The base address is truncated from

LSByte if the BALEN is less than 4. See Definition of logical addresses on page 287.

The on-air addresses are defined in the BASEn and PREFIXn registers, and it is only when writing these

registers the user will have to relate to actual on-air addresses. For other radio address registers such as

the TXADDRESS, RXADDRESSES and RXMATCH registers, logical radio addresses ranging from 0 to 7 are

being used. The relationship between the on-air radio addresses and the logical addresses is described in

Definition of logical addresses on page 287.

Logical address

Base address

Prefix byte

BASE0

PREFIX0.AP0

BASE1

PREFIX0.AP1

BASE1

PREFIX0.AP2

BASE1

PREFIX0.AP3

BASE1

PREFIX1.AP4

BASE1

PREFIX1.AP5

BASE1

PREFIX1.AP6

BASE1

PREFIX1.AP7

Table 58: Definition of logical addresses

6.14.5 Data whitening

The RADIO is able to do packet whitening and de-whitening.

See WHITEEN in PCNF1 register for how to enable whitening. When enabled, whitening and de-whitening

will be handled by the RADIO automatically as packets are sent and received.

The whitening word is generated using polynomial g(D) = D7+ D4 + 1, which then is XORed with the data

packet that is to be whitened, or de-whitened. See the figure below.

4430_161 v1.0

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