NRF52820-QDAA-R datasheet(170/437 Pages) NORDIC

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Peripherals

the time needed to switch off the receiver, and then switch the transmitter back on. The TIFS register can

be written any time before the last bit on air is received.

This timing is illustrated in the figure below.

PAYLOAD

CRC

RXDISABLE

TXRU

S0 L S1

PAYLOAD

TIFS

Change to SHORTS and

TIFS OK

Change to MODE OK

Figure 59: IFS timing detail

The TIFS duration starts after the last bit on air (just before the END event), and elapses with first bit being

transmitted on air (just after READY event).

TIFS is only enforced if the shortcuts END to DISABLE and DISABLED to TXEN or END to DISABLE and

DISABLED to RXEN are enabled.

TIFS is qualified for use in IEEE 802.15.4 250kbps mode, Long Range (125 kbps and 500 kbps) Bluetooth®

Low Energy modes, and 1 Mbps and 2 Mbps Bluetooth® Low Energy modes, using the default ramp-up

mode.

SHORTS and TIFS registers are not double-buffered, and can be updated at any point before the last bit on

air is received. The MODE register is double-buffered and sampled at the TXEN or RXEN task.

6.12.10 Device address match

The device address match feature is tailored for address whitelisting in Bluetooth® low energy and similar

implementations.

This feature enables on-the-fly device address matching while receiving a packet on air. This feature only

works in receive mode and when the RADIO is configured for little endian, see PCNF1.ENDIAN.

The device address match unit assumes that the first 48 bits of the payload are the device address and

that bit number 6 in S0 is the TxAdd bit. See the Bluetooth® Core Specification for more information about

device addresses, TxAdd, and whitelisting.

The RADIO is able to listen for eight different device addresses at the same time. These addresses are

specified in a DAB/DAP register pair, one pair per address, in addition to a TxAdd bit configured in the

DACNF register. The DAB register specifies the 32 least significant bits of the device address, while the DAP

Each of the device addresses can be individually included or excluded from the matching mechanism. This

is configured in the DACNF register.

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NRF52820-QDAA-R Datasheet(PDF) 170 Page - Nordic Semiconductor