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SX1231
WIRELESS & SENSING PRODUCTS
Upon detection of a valid packet, the sequencing is altered, as shown below:
PayloadReady
ListenCriteria
passed
DATASHEET
ListenEnd = 00
Listen Mode
Idle
Rx
ListenEnd = 01
Listen Mode
Idle
Rx
Mode
Idle
Rx
Idle
Rx
ListenEnd = 10
Listen Mode
Figure 22. Listen Mode Sequence (wanted signal is received)
4.3.4. Stopping Listen Mode
To abort Listen mode operation, the following procedure must be respected:
?
?
Program RegOpMode with ListenOn =0, ListenAbort =1, and the desired setting for the Mode bits (Sleep, Stdby, FS, Rx
or Tx mode) in a single SPI access
Program RegOpMode with ListenOn =0, ListenAbort =0, and the desired setting for the Mode bits (Sleep, Stdby, FS, Rx
or Tx mode) in a second SPI access
4.3.5. RC Timer Accuracy
All timings of the Listen Mode rely on the accuracy of the internal low-power RC oscillator. This oscillator is automatically
calibrated at the device power-up, and it is a user-transparent process.
For applications enduring large temperature variations, and for which the power supply is never removed, RC calibration
can be performed upon user request. RcCalStart in RegOsc1 can be used to trigger this calibration, and the flag
RcCalDone will be set automatically when the calibration is over.
Rev. 7 - June 2013
Page 43
www.semtech.com
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