Transceiver Operating Modes
MKW01xxRM Reference Manual, Rev. 3, 04/2016
6-4
Freescale Semiconductor, Inc.
•
DC Cutoff’s group delay -
Tdcc = max(8 , 2^(round(log2(8 * RxBw * Tbit)+1)) / (4 * RxBw)
•
PLL lock time after AFC adjustment -
Tpllafc = 5 / PLLBW (PLLBW default = 300 kHz, see
for settings)
•
AFC sample time -
Tafc = 4 * Tbit
(also denoted TS_AFC in the general specification)
•
RSSI sample time -
Trssi = 2 * int(4 * RxBw * Tbit)/(4 * RxBw)
(aka TS_RSSI)
NOTE
The above timings represent maximum settling times, and shorter settling
times may be observed in real cases
6.2.4
RX Start Procedure
As described in the former sections, the
RxReady
interrupt warns the MCU that the receiver is ready.
•
In Continuous mode with Bit Synchronizer, the receiver will start locking its Bit Synchronizer on
a minimum or 12 bits of received preamble, before the reception of correct Data, or Sync Word (if
enabled) can occur.
•
In Continuous mode without Bit Synchronizer, valid data will be available on DIO2/DATA right
after the
RxReady
interrupt.
•
In Packet mode, the receiver will start locking its Bit Synchronizer on a minimum or 12 bits of
received preamble, before the reception of correct Data, or Sync Word (if enabled) can occur.
•
Section 5.7.12, “Bit Synchronizer”
, for details.
6.2.5
Optimized Frequency Hopping Sequences
In a frequency hopping-like application, it is required to turn off the transmitter when hopping from one
channel to another, to avoid spectral splatter and obtain the best spectral purity.
•
Transmitter hop from Ch A to Ch B - it is advised to step through the RX mode:
1.Transceiver is in TX mode in Ch A
2.Program the MKW01Z128 in RX mode
3.Change the carrier frequency in the
RegFrf
registers
4.Turn the transceiver back to TX mode
5.Respect the TX start procedure
•
Receiver hop from Ch A to Ch B -
1.Transceiver is in RX mode in Ch A
2.Change the carrier frequency in the
RegFrf
registers Program the transceiver in FS mode
3.Program the MKW01Z128 in FS mode
4.Turn the transceiver back to RX mode
5.Respect the RX start procedure
NOTE
All sequences described above are assuming that the sequencer is turned on
(SequencerOff=0 in RegOpMode).
Summary of Contents for MKW01Z128
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Page 133: ...MKW01Z128 MCU Reference Manual Rev 3 04 2016 2 Freescale Semiconductor Inc...
Page 233: ...Module clocks MKW01Z128 MCU Reference Manual Rev 3 04 2016 102 Freescale Semiconductor Inc...
Page 513: ...Interrupts MKW01Z128 MCU Reference Manual Rev 3 04 2016 382 Freescale Semiconductor Inc...
Page 633: ...CMP Trigger Mode MKW01Z128 MCU Reference Manual Rev 3 04 2016 502 Freescale Semiconductor Inc...
