NRF52810-QFAA-R datasheet(292/483 Pages) NORDIC

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Peripherals

RXRU

S0 L S1

PAYLOAD

CRC

RXDISABLE

’X’

Figure 67: Receive sequence using shortcuts to avoid delays

The RADIO is able to receive multiple packets one after the other without having to disable and re-enable

the RADIO between packets, this is illustrated Reception of multiple packets on page 292.

RXRU

S0 L S1

PAYLOAD

CRC

RXDISABLE

S0 L S1

PAYLOAD

CRC

’X’

RXIDLE

Figure 68: Reception of multiple packets

6.14.10 Received signal strength indicator (RSSI)

A mechanism for measuring the power in the received radio signal is implemented. This feature is called

received signal strength indicator (RSSI).

Sampling of the received signal strength is started by using the RSSISTART task. The sample can be read

from the RSSISAMPLE register.

The sample period of the RSSI is defined by RSSIPERIOD, see the device product specification for details. The

RSSI sample will hold the average received signal strength during this sample period.

For the RSSI sample to be valid, the radio has to be enabled in the receive mode (RXEN task) and the

reception has to be started (READY event followed by START task).

6.14.11 Interframe spacing

Interframe spacing is the time interval between two consecutive packets.

It is defined as the time (in microseconds) from the end of the last bit of the previous packet received and

to the start of the first bit of the subsequent packet that is transmitted. The radio is able to enforce this

interval as specified in the TIFS register as long as TIFS is not specified to be shorter than the radio’s turn-

around time, i.e. the time needed to switch off the receiver, and switch back on the transmitter.

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