Data Sheet

ManualsBrandsVelleman ManualsData Communication and Human Input DevicesVelleman 2.4G Transceiver nRF24L01 Module (2pk)

Revision 2.0 Page 58 of 74

nRF24L01 Product Specification

Table 24. Register map of nRF24L01

N/A RX_PLD 255:0 X R Read by separate SPI command

RX data payload register. 1 - 32 bytes.

This register is implemented as a FIFO with

three levels.

All RX channels share the same FIFO

DYNPD

Enable dynamic payload length

Reserved 7:6 0 R/W Only ‘00’ allowed

DPL_P5 5 0 R/W Enable dyn. payload length data pipe 5.

(Requires EN_DPL and ENAA_P5)

DPL_P4 4 0 R/W Enable dyn. payload length data pipe 4.

(Requires EN_DPL and ENAA_P4)

DPL_P3 3 0 R/W Enable dyn. payload length data pipe 3.

(Requires EN_DPL and ENAA_P3)

DPL_P2 2 0 R/W Enable dyn. payload length data pipe 2.

(Requires EN_DPL and ENAA_P2)

DPL_P1 1 0 R/W Enable dyn. payload length data pipe 1.

(Requires EN_DPL and ENAA_P1)

DPL_P0 0 0 R/W Enable dyn. payload length data pipe 0.

(Requires EN_DPL and ENAA_P0)

FEATURE

R/W Feature Register

Reserved 7:3 0 R/W Only ‘00000’ allowed

EN_DPL 2 0 R/W Enables Dynamic Payload Length

EN_ACK_PAY

1 0 R/W Enables Payload with ACK

EN_DYN_ACK 0 0 R/W Enables the W_TX_PAYLOAD_NOACK command

a. This is the time the PTX is waiting for an ACK packet before a retransmit is made. The PTX is in RX mode

for a minimum of 250µS, but it stays in RX mode to the end of the packet if that is longer than 250µS. Then

it goes to standby-I mode for the rest of the specified ARD. After the ARD it goes to TX mode and then

retransmits the packet.

b. The

RX_DR IRQ is asserted by a new packet arrival event. The procedure for handling this interrupt

should be: 1) read payload through SPI, 2) clear

RX_DR IRQ, 3) read FIFO_STATUS to check if there

are more payloads available in RX FIFO, 4) if there are more data in RX FIFO, repeat from 1)

c. To activate this feature use the

ACTIVATE SPI command followed by data 0x73. The corresponding bits

in the

FEATURE register must be set.

d. If ACK packet payload is activated, ACK packets have dynamic payload lengths and the Dynamic Pay-

load Length feature should be enabled for pipe 0 on the PTX and PRX. This is to ensure that they receive

the ACK packets with payloads. If the payload in ACK is more than 15 byte in 2Mbps mode the ARD must

be 500µS or more, and if the payload is more than 5byte in 1Mbps mode the ARD must be 500µS or more.

Address

(Hex)

Mnemonic Bit

Reset

Value

Type Description