參數(shù)資料
型號(hào): EM2420TR
廠商: Electronic Theatre Controls, Inc.
英文描述: 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver
中文描述: 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器
文件頁(yè)數(shù): 71/89頁(yè)
文件大小: 1758K
代理商: EM2420TR
EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 71 of 89
FSCTRL (0x18) - Frequency Synthesizer Control and Status
Bit
Field Name
Reset
R/W
Description
15:14
LOCK_THR[1:0]
1
R/W
Number of consecutive reference clock periods with successful
synchronisation windows required to indicate lock:
0: 64
1: 128 (recommended)
2: 256
3: 512
13
CAL_DONE
0
R
Calibration has been performed since the last time the frequency
synthesizer was turned on.
12
CAL_RUNNING
0
R
Calibration status, '1' when calibration in progress and ‘0’
otherwise.
11
LOCK_LENGTH
0
R/W
Synchronisation window pulse width:
0: 2 prescaler clock periods (recommended)
1: 4 prescaler clock periods
10
LOCK_STATUS
0
R
Frequency synthesizer lock status:
0 : Frequency synthesizer is out of lock
1 : Frequency synthesizer is in lock
9:0
FREQ[9:0]
357
(2405
MHz)
R/W
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
51 for further information.
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