NRF24L01P-R7 datasheet(51/78 Pages) NORDIC

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nRF24L01+ Product Specification

Table 20. Command set for the nRF24L01+ SPI

The W_REGISTER and R_REGISTER commands operate on single or multi-byte registers. When accessing

multi-byte registers read or write to the MSBit of LSByte first. You can terminate the writing before all bytes

in a multi-byte register are written, leaving the unwritten MSByte(s) unchanged. For example, the LSByte

of RX_ADDR_P0 can be modified by writing only one byte to the RX_ADDR_P0 register. The content of the

status register is always read to MISO after a high to low transition on CSN.

Command name

Command

word (binary)

# Data bytes

Operation

R_REGISTER

000A AAAA 1 to 5

LSByte first

Read command and status registers. AAAAA =

5 bit Register Map Address

W_REGISTER

001A AAAA 1 to 5

LSByte first

Write command and status registers. AAAAA = 5

bit Register Map Address

Executable in power down or standby modes

only.

R_RX_PAYLOAD

0110 0001

1 to 32

LSByte first

Read RX-payload: 1 – 32 bytes. A read operation

always starts at byte 0. Payload is deleted from

FIFO after it is read. Used in RX mode.

W_TX_PAYLOAD

1010 0000

1 to 32

LSByte first

Write TX-payload: 1 – 32 bytes. A write operation

always starts at byte 0 used in TX payload.

FLUSH_TX

1110 0001

Flush TX FIFO, used in TX mode

FLUSH_RX

1110 0010

Flush RX FIFO, used in RX mode

Should not be executed during transmission of

acknowledge, that is, acknowledge package will

not be completed.

REUSE_TX_PL

1110 0011

Used for a PTX device

Reuse last transmitted payload.

TX payload reuse is active until

W_TX_PAYLOAD or FLUSH TX is executed. TX

payload reuse must not be activated or deacti-

vated during package transmission.

R_RX_PL_WIDa

0110 0000

Read RX payload width for the top

R_RX_PAYLOAD

in the RX FIFO.

Note:

Flush RX FIFO if the read value is larger

than 32 bytes.

W_ACK_PAYLOADa

1010 1PPP

1 to 32

LSByte first

Used in RX mode.

Write Payload to be transmitted together with

ACK packet on PIPE PPP. (PPP valid in the

range from 000 to 101). Maximum three ACK

packet payloads can be pending. Payloads with

same PPP are handled using first in - first out

principle. Write payload: 1– 32 bytes. A write

operation always starts at byte 0.

W_TX_PAYLOAD_NO

ACKa

1011 0000

1 to 32

LSByte first

Used in TX mode. Disables AUTOACK on this

specific packet.

NOP

1111 1111

No Operation. Might be used to read the STATUS

a. The bits in the FEATURE register shown in

Table 28. on page 63 have to be set.

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