RFM66W Datasheet, PDF (40/87 Pages) List of Unclassifed Manufacturers – 868 & 915MHz Ultra Low Power High Link Budget Integrated UHF Transceiver

WIRELESS & SENSING
RFM66W
DATASHEET
4.3. Top Level Sequencer
Depending on the application, it is desirable to be able to change the mode of the circuit according to a predefined
sequence without access to the serial interface. Listen mode and Auto Modes as defined in RF69 are example of such
predefined sequences. In order to define different sequences or scenarios a user-programmable state machine, called Top
Level Sequencer (Sequencer in short), can automatically control the chip modes.
The Sequencer is activated by setting SequencerStart in RegSeqConfig1 to 1 in Sleep or Standby mode.
It is also possible to force the Idle state of the Sequencer by setting SequencerStop to 1 at any time.
4.3.1. Sequencer States
The Sequencer takes control of the chip operation over 7 possible states:
Table 21 Sequencer States
Sequencer
State
Description
SequencerIdle State
The Sequencer is not activated. Sending a SequencerStart command will launch it.
Note: the Idle state of the Sequencer is independant of the actual chip Mode. For example, the
Sequencer can be Idle, whilst the chip is in Rx mode.
When coming from a LowPower request, the Sequencer will be Idle in Sleep mode.
WaitFifo State
The Sequencer waits for FifoThreshold interrupt before entering the Transmit state.
LowPower State
The chip is in low-power mode, either Standby or Sleep, as defined in Sequencer Low Power State.
The Sequencer waits only for the Timer1 interrupt.
Transmit State
The transmitter in on.
Receive State
The receiver in on.
PacketReceived State The receiver is on and a packet has been received. It is stored in the FIFO.
ReceiveRestart State The receiver is re-started, for example to start a new AGC and/or AFC after a valid packet reception.
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