NRF24L01P-R datasheet(45/78 Pages) NORDIC

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nRF24L01+ Product Specification

7.8

Enhanced ShockBurst™ transaction diagram

This section describes several scenarios for the Enhanced ShockBurst™ automatic transaction handling.

The call outs in this section’s figures indicate the IRQs and other events. For MCU activity the event may

be placed at a different timeframe.

Note:

The figures in this section indicate the earliest possible download (DL) of the packet to the

MCU and the latest possible upload (UL) of payload to the transmitter.

7.8.1

Single transaction with ACK packet and interrupts

In Figure 18. the basic auto acknowledgement is shown. After the packet is transmitted by the PTX and

received by the PRX the ACK packet is transmitted from the PRX to the PTX. The RX_DR IRQ is asserted

after the packet is received by the PRX, whereas the TX_DS IRQ is asserted when the packet is acknowl-

edged and the ACK packet is received by the PTX.

Figure 18. TX/RX cycles with ACK and the according interrupts

1 Radio Turn Around Delay

TX:PID=1

PTX

PRX

ACK:PID=1

MCU PTX

130us1

IRQ

MCU PRX

Packet received

IRQ: RX DR (PID=1)

Ack received

IRQ:TX DS (PID=1)

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