RF69 datasheet(42/81 Pages) ETC2

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RF69

Page 41

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Idle

Upon detection of a valid packet, the sequencing is altered, as shown below:

PayloadReady

ListenCriteria

passed

ListenEnd = 00

Idle

Listen Mode

ListenEnd = 01

ListenEnd = 10

Listen Mode

Idle

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.

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