NRF52810-QCAA-R datasheet(291/483 Pages) NORDIC

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Peripherals

TXRU

S0 L S1

PAYLOAD

CRC

TXDISABLE

S0 L S1

PAYLOAD

CRC

(carrier)

TXIDLE

Figure 65: Transmission of multiple packets

6.14.9 Receive sequence

Before the RADIO is able to receive a packet, it must first ramp up in RX mode

See RXRU in Radio states on page 289 and Receive sequence on page 291. An RXRU ramp-up

sequence is initiated when the RXEN task is triggered. After the radio has successfully ramped up it

will generate the READY event indicating that a packet reception can be initiated. A packet reception is

initiated by triggering the START task. As illustrated in Radio states on page 289 the START task can, first

be triggered after the RADIO has entered into the RXIDLE state.

Receive sequence on page 291 illustrates a single packet reception where the CPU manually triggers

the different tasks needed to control the flow of the RADIO, i.e. no shortcuts are used. If shortcuts are not

used, a certain amount of delay, caused by CPU execution, is expected between READY and START, and

between END and DISABLE. As illustrated Receive sequence on page 291 the RADIO will be listening

and possibly receiving undefined data, illustrated with an 'X', from START and until a packet with valid

preamble (P) is received.

RXRU

RXIDLE

S0 L S1

PAYLOAD

CRC

RXIDLE

RXDISABLE

’X’

Figure 66: Receive sequence

A slightly modified version of the receive sequence from Receive sequence on page 291 is illustrated

in Receive sequence using shortcuts to avoid delays on page 292 where the the RADIO is configured to

use shortcuts between READY and START, and between END and DISABLE, which means that no delay is

introduced.

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