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Freescale Semiconductor, Inc.
STATE MACHINES
Table 9: Data Rate selection
DR1 DR0 Selected Ratio
0 0 1.0 - 1.4 kBd
0 1 2 - 2.7 kBd
1
0
4 - 5.3 kBd
1 1 8.6 - 10.6 kBd
- MG sets the mixer gain:
0 = Normal,
1 = -17dB (typical).
- MS switches the MIXOUT pin:
0 = To the mixer output,
1 = To the IF input.
Table 10: Mixer and MIXOUTconfiguration
MG
MS Mixer Gain MIXOUT
0
0
Normal
Mixer output
0
1
1
1 Normal IF input
0 Reduced Mixer output
1 Forbidden, mixer test mode only
The combination MG=1, MS=1 is forbidden in any application. It configures the receiver in a test mode where
the mixer runs at f VCO /4.
- PG sets the phase comparator gain (see “The local oscillator PLL” chapter, page 4):
0 = High gain mode,
1 = Low gain mode.
STATE MACHINES
AFTER POR RESET STATE MACHINE
There are 3 different modes for the receiver.
Sleep mode corresponds to the low power consumption mode:
- if SOE=0, the whole receiver is shutdown,
- if SOE=1, the strobe oscillator remains active.
Configuration mode is used for writing or reading the internal registers. In this mode, the SPI is slave and the
receiver is enabled. The crystal oscillator is running and generates the clock for the SPI. This implies that before
the circuit is in sleep mode, a delay corresponding to the crystal oscillator wake-up time must be inserted
between the falling edge on RESETB and the start of the transmission on the SPI lines. The local oscillator is
running as well. This means that demodulated data can be read on DMDAT but are not sent by the SPI.
In Run mode , the receiver is enabled (crystal and local oscillators are running). It is either waiting for an RF
telegram or receiving one.
Figure 14 details the state machine after Power On Reset (POR). The state machine is synchronized by a
sampling clock at 615kHz (sampling period Ts=1.6μs), derivated from the crystal oscillator. The transition time
between state 1 and states 2 or 6 is less than 3 ′ Ts.
12
MC33591 Technical Data
For More Information On This Product,
Go to: www.freescale.com
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