NRF24L01P-R7 datasheet(37/78 Pages) NORDIC

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nRF24L01+ Product Specification

7.5.2

PRX operation

The flowchart in Figure 11. outlines how a nRF24L01+ configured as a PRX behaves after entering

standby-I mode.

Note: ShockBurst™ operation is outlined with a dashed square.

Figure 11. PRX operations in Enhanced ShockBurst™

Activate PRX mode by setting the CE pin high. The nRF24L01+ enters RX mode and starts searching for

packets. If a packet is received and Auto Acknowledgement is enabled, nRF24L01+ decides if the packet

is new or a copy of a previously received packet. If the packet is new the payload is made available in the

Start Primary RX

Standby-I mode

Is CE =1?

TX mode

Transmit ACK

Is Auto

Acknowledgement

enabled?

RX mode

Yes

No_ACK set in

received packet?

Is the received

packet a new

packet?

TX Settling

Was there payload

attached with the last

ACK?

RX Settling

Pending

payload in TX

FIFO?

Put payload in RX

FIFO and

set RX_DR IRQ

Packet

received?

Yes

Is CE =1?

Yes

Put payload in RX

FIFO and

set RX_DR IRQ

Discard packet

Yes

TX mode

Transmit ACK with

payload

TX Settling

Set TX_DS IRQ

Yes

ShockBurst operation

RX FIFO

Full?

Yes

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