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MKW01xxRM Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
6-1
Chapter 6
Transceiver Operating Modes
This chapter describes the operating modes of the MKW01Z128 transceiver.
6.1
Basic Modes
The transceiver can be programmed to 5 different basic modes which are described in
.
By default, when switching from a mode to another one, the sub-blocks are woken up according to a
pre-defined and optimized sequence. Alternatively, these operating modes can be selected directly by
disabling the automatic sequencer (
SequencerOff
in
RegOpMode = 1
).
6.2
Automatic Sequencer and Wake-Up Times
By default, when switching from one operating mode to another, the circuit takes care of the sequence of
events in such a way that the transition timing is optimized. For example, when switching from Sleep mode
to Transmit mode, the device goes first to Standby mode (XO started), then to frequency synthesizer mode,
and finally, when the PLL has locked, to transmit mode. Entering transmit mode is also made according
to a predefined sequence starting with the wake-up of the PA regulator before applying a ramp-up on the
PA and generating the DCLK clock.
•
The crystal oscillator wake-up time, TS_OSC, is directly related to the time for the crystal
oscillator to reach its steady state. It depends notably on the crystal characteristics.
•
The frequency synthesizer wake-up time, TS_FS, is directly related to the time needed by the PLL
to reach its steady state. The signal PLL_LOCK, provided on an external pin, gives an indication
of the lock status. It goes high when the PLL reaches its locking range.
Four specific cases can be highlighted:
•
Transmitter Wake Up time from Sleep mode
= TS_FS + TS_TR
Table 6-1. Basic Transceiver Modes
ListenOn
in
RegOpMode
Mode
in
RegOpMode
Selected mode
Enabled blocks
0
0 0 0
Sleep Mode
None
0
0 0 1
Stand-by Mode
Top regulator and crystal oscillator
0
0 1 0
FS Mode
Frequency synthesizer
0
0 1 1
Transmit Mode
Frequency synthesizer and transmitter
0
1 0 0
Receive Mode
Frequency synthesizer and receiver
1
x
Listen Mode
See Listen Mode, section
Содержание MKW01Z128
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