CC2420 Datasheet, PDF (69/92 Pages) List of Unclassifed Manufacturers – 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver

CC2420
FSCTRL (0x18) - Frequency Synthesizer Control and Status
Bit
Field Name
15:14 LOCK_THR[1:0]
13
CAL_DONE
12
CAL_RUNNING
11
LOCK_LENGTH
10
LOCK_STATUS
9:0
FREQ[9:0]
Reset R/W
1
R/W
0
R
0
R
0
R/W
0
R
357 R/W
(2405
MHz)
Description
Number of consecutive reference clock periods with successful
synchronisation windows required to indicate lock:
0: 64
1: 128 (recommended)
2: 256
3: 512
Calibration has been performed since the last time the frequency
synthesizer was turned on.
Calibration status, '1' when calibration in progress and ‘0’
otherwise.
Synchronisation window pulse width:
0: 2 prescaler clock periods (recommended)
1: 4 prescaler clock periods
Frequency synthesizer lock status:
0 : Frequency synthesizer is out of lock
1 : Frequency synthesizer is in lock
Frequency control word, controlling the RF operating frequency
F_C. In transmit mode, the local oscillator (LO) frequency equals
F_C. In receive mode, the LO frequency is 2 MHz below F_C.
F_C = 2048 + FREQ[9:0] MHz
See the Frequency and Channel Programming section on page
50 for further information.
SWRS041B
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