LLCC68 datasheet(73/106 Pages) SEMTECH

73 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

73 of 106

Semtech

www.semtech.com

13.2.2 ReadRegister Function

The command ReadRegister(...) allows reading a block of data starting at a given address. The address is auto-incremented

after each byte. The SPI data transfer is described in Table 13-25. Note that the host has to send an NOP after sending the 2

bytes of address to start receiving data bytes on the next NOP sent.

13.2.3 WriteBuffer Function

This function is used to store data payload to be transmitted. The address is auto-incremented; when it exceeds the value

of 255 it is wrapped back to 0 due to the circular nature of the data buffer. The address starts with an offset set as a

parameter of the function. Table 13-26 describes the SPI data transfer.

13.2.4 ReadBuffer Function

This function allows reading (n-3) bytes of payload received starting at offset. Note that the NOP must be sent after sending

the offset.

Table 13-25: ReadRegister SPI Transaction

Byte

...

Data from

host

Opcode

= 0x1D

address[15:8]

address[7:0]

NOP

...

NOP

Data to host

RFU

Status

data@address

data@address+1

...

data@address+

(n-4)

Table 13-26: WriteBuffer SPI Transaction

Byte

...

Data from host

Opcode =

0x0E

offset

data@offset

data@offset+1

...

data@offset+(n-2)

Data to host

RFU

Status

...

Status

Table 13-27: ReadBuffer SPI Transaction

Byte

...

Data from

host

Opcode

= 0x1E

offset

NOP

...

NOP

Data to host

RFU

Status

data@offset

data@offset+1

...

data@offset+(n-3)

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