BK2425WD datasheet(13/30 Pages) ETC2

13 / 30 page

BK2425

Revision 1.0

Proprietary and Confidential

Page 13 of 30

ACTIVATE

0101 0000

This write command followed by data 0x73 activates

the following features:

• R_RX_PL_WID

• W_ACK_PAYLOAD

• W_TX_PAYLOAD_NOACK

A new ACTIVATE command with the same data

deactivates them again. This is executable in power

down or stand by modes only.

The R_RX_PL_WID, W_ACK_PAYLOAD, and

W_TX_PAYLOAD_NOACK features registers are

initially in a deactivated state; a write has no effect, a

read only results in zeros on MISO. To activate these

registers, use the ACTIVATE command followed by

data 0x73. Then they can be accessed as any other

deactivate the registers again.

This write command followed by data 0x53 toggles

the register bank, and the current register bank

number can be read out from REG7 [7]

R_RX_PL_WID

0110 0000

Read RX-payload width for the top

R_RX_PAYLOAD in the RX FIFO.

W_ACK_PAYLOAD

1010 1PPP

1 to 32

LSB byte 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

ACK

1011 0000

1 to 32

LSB byte first

Used in TX mode. Disables AUTOACK on this

specific packet.

NOP

1111 1111

No Operation. Might be used to read the STATUS

Table 2 SPI command

6.3.2

SPI Timing

C 7

C 6

C 5

C 4

C 3

C 2

C 1

C 0

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

S 7

S 6

S 5

S 4

S 3

S 2

S 1

S 0

H i - Z

H I - Z

S 7

S 6

S 5

S 4

S 3

S 2

S 1

S 0

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

S C K

C S N

M O S I

M I S O

M O S I

W r i t e t o S P I r e g i s t e r:

R e a d f r o m S P I r e g i s t e r:

C 7

C 6

C 5

C 4

C 3

C 2

C 1

C 0

Figure 6 SPI timing

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