LLCC68 datasheet(89/111 Pages) SEMTECH

89 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

89 of 111

Semtech

LLCC68

www.semtech.com

In the LLCC68, the CRC can be fully configured and the polynomial used, and the initial values can be entered directly via register access.

Table 13-59: GFSK PacketParam6 - PacketType

PacketType

Description

0x00

The packet length is known on both sides, the size of the payload is not added to the packet

0x01

The packet is on variable size, the first byte of the payload is the size of the packet

Table 13-60: GFSK PacketParam7 - PayloadLength

AddrComp

Description

0x00 to 0xFF

Size of the payload (in bytes) to transmit or maximum size of the payload that the receiver can accept.

Table 13-61: GFSK PacketParam8 - CRCType

CRCType

Description

0x01

CRC_OFF (No CRC)

0x00

CRC_1_BYTE (CRC computed on 1 byte)

0x02

CRC_2_BYTE(CRC computed on 2 byte)

0x04

CRC_1_BYTE_INV(CRC computed on 1 byte and inverted)

0x06

CRC_2_BYTE_INV(CRC computed on 2 byte and inverted)

Table 13-62: CRC Initial Value Programming

Default Value

CRC MSB Initial Value [15:8]

0x06BC

0x1D

CRC LSB Initial Value [7:0]

0x06BD

0x0F

Table 13-63: CRC Polynomial Programming

Default Value

CRC MSB polynomial value [15:8]

0x06BE

0x10

CRC LSB polynomial value [7:0]

0x06BF

0x21

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