CC2420Z-RTR1 datasheet(69/92 Pages) TI

69 / 92 page

CC2420

SWRS041B

Page 69 of 89

FSCTRL (0x18) - Frequency Synthesizer Control and Status

Bit

Field Name

Reset

R/W

Description

15:14

LOCK_THR[1:0]

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

CAL_DONE

Calibration has been performed since the last time the frequency

synthesizer was turned on.

CAL_RUNNING

Calibration status, '1' when calibration in progress and ‘0’

otherwise.

LOCK_LENGTH

R/W

Synchronisation window pulse width:

0: 2 prescaler clock periods (recommended)

1: 4 prescaler clock periods

LOCK_STATUS

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

FC. In transmit mode, the local oscillator (LO) frequency equals

FC. In receive mode, the LO frequency is 2 MHz below FC.

FC = 2048 + FREQ[9:0] MHz

See the Frequency and Channel Programming section on page

50 for further information.

CC2420Z-RTR1 数据表(PDF) 69 Page - Texas Instruments

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