LLCC68 datasheet(65/106 Pages) SEMTECH

65 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

65 of 106

Semtech

www.semtech.com

This command sets the chip in RX mode, waiting for the reception of one or several packets. The receiver mode operates

with a timeout to provide maximum flexibility to end users.

When the timeout is active (0x000000 < timeout < 0xFFFFFF), the radio will stop the reception at the end of the timeout

period unless a preamble and Sync Word (in GFSK) or Header (in LoRa®) has been detected. This is to ensure that a valid

packet will not be dropped in the middle of the reception due to the pre-defined timeout. By default, the timer will be

stopped only if the Sync Word or header has been detected. However, it is also possible to stop the timer upon preamble

detection by using the command StopTimerOnPreamble(...).

13.1.6 StopTimerOnPreamble

The command StopTimerOnPreamble(...) allows the user to select if the timer is stopped upon preamble detection of Sync

Word / header detection.

The enable byte definition is given in the following table.

By default, the timer is stopped only when the Sync Word (in GFSK) or Header (in LoRa®) has been detected. When the

function StopTimerOnPreamble(...) is used with the value enable at 0x01, then the timer will be stopped upon preamble

Table 13-9: SetRx Timeout Duration

Timeout(23:0)

Timeout Duration

0x000000

No timeout. Rx Single mode. The device will stay in RX Mode until a reception occurs and the devices return

in STBY_RC mode upon completion

0xFFFFFF

Rx Continuous mode. The device remains in RX mode until the host sends a command to change the

operation mode. The device can receive several packets. Each time a packet is received, a packet done

indication is given to the host and the device will automatically search for a new packet.

Others

Timeout active. The device remains in RX mode, it returns automatically to STBY_RC mode on timer

end-of-count or when a packet has been received. As soon as a packet is detected, the timer is automatically

disabled to allow complete reception of the packet. The maximum timeout is then 262 s.

Table 13-10: StopTimerOnPreamble SPI Transaction

Byte

Data from host

Opcode = 0x9F

StopOnPreambleParam

Table 13-11: StopOnPreambParam Definition

StopOnPreambleParam

Value

Description

disable

0x00

Timer is stopped upon Sync Word or Header detection

enable

0x01

Timer is stopped upon preamble detection

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