oscillator and make the chip enter the IDLE
When wake on radio is enabled, the WOR
module will control the voltage regulator as
has two active modes: receive and
transmit. These modes are activated directly
command strobes, or automatically by Wake
The frequency synthesizer must be calibrate
has one manual calibration
automatic calibration options, controlled by the
Calibrate when going from IDLE to either
ibrate when going from either RX or TX
Calibrate every fourth time when going
from either RX or TX to IDLE
If the radio goes from TX or RX to IDLE by
The calibration takes a constant
number of XOSC cycles (see
When RX is activated, the chip will remain in
receive mode until a packet is successfully
X termination timer expires
). Note: the probability that a
false sync word is detected can be reduced by
using PQT, CS, maximum sync word length
and sync word qualifier mode as describe in
. After a packet is successfully
received the radio controller will then go to the
setting. The possible destinations are:
quency synthesizer on and
ready at the TX frequency. Activate TX
TX: Start sending preambles
RX: Start search for a new packet
Similarly, when TX is active the chip will
remain in the TX state until the current packet
has been successfully trans
state will change as indicated by the
destinations are the same as for RX.
The MCU can manually change the state from
RX to TX and vice versa by using the
f the radio controller is
currently in transmit and the
used, the current transmission will be ended
and the transition to RX will be done.
If the radio controller is in RX when the
command strobes are used, the TX
tion will be used. If the channel is
not clear, the chip will remain in RX. The
conditions for clear channel assessment. See
command strobe can always be
used to force the radio controller to go to the
The optional Wake on Radio (WOR)
packets without MCU interaction.
strobe command is sent on
oscillator must be enabled before the WOR
strobe can be used, as it is
. After a programmable time in RX, the
for details on how the timeout works.
into the IDLE state to exit
can be set up to signal the MCU that a
packet has been received by using the
ns. If a packet is received, the
behaviour at the end of the received packet.
When the MCU has read the packet, it can put
the chip back into SLEEP with the
contents in the SLEEP state.
WOR timer has two events, Event
1. In the SLEEP state wit
activated, reaching Event
digital regulator and star
t the crystal oscillator.