CC2400-RTR1 datasheet(60/84 Pages) TI2

60 / 84 page

CC2400

SWRS042A

Page 60 of 83

FSCTRL (0x01) - Frequency Synthesiser Control and Status

Bit

Field Name

Reset

R/W

Description

15:6

Reserved, write as 0.

5:4

LOCK_THRESHOLD[1:0]

R/W

Number of consecutive reference clock periods with successful

sync windows required to indicate lock:

0: 64

1: 128

2: 256

3: 512

CAL_DONE

Calibration has been performed since the last time the FS was

turned on.

CAL_RUNNING

Calibration status, '1' when calibration in progress.

LOCK_LENGTH

R/W

LOCK_WINDOW pulse width:

0: 2 CLK_PRE periods

1: 4 CLK_PRE periods

LOCK_STATUS

'1' when PLL is in lock, otherwise '0'.

FSDIV (0x02) - Frequency Synthesiser Frequency Division Control

Bit

Field Name

Reset

R/W

Description

15:12

Reserved, write as 0.

11:10

FREQ[11:10]

Read only.

Directly gives the right frequency in MHz when reading/writing

FREQ[11:0]

9:0

FREQ[9:0]

353

R/W

Frequency control word.

[

][ ]

2048

FREQ

[MHz]

where

fc is the channel centre frequency. See page 47 for a

description of how to program the channel for tansmit and

receive modes respectively.

Reading/writing FREQ[11:0] gives the right frequency in MHz.

The default value corresponds to

fc=2401MHz.

MDMCTRL (0x03) - Modem Control and Status

Bit

Field Name

Reset

R/W

Description

15:13

Reserved, write as 0.

12:7

MOD_OFFSET[5:0]

R/W

Modulator/Demodulator centre frequency in 15.625 kHz steps

(for the receiver the steps are relative to 1 MHz, for the

transmitter the steps are relative to 0MHz when

MDMTST0.TX_1MHZ_OFFSET_N=1

Two's complement signed value. I.e. MOD_OFFSET=0x1F

centre frequency=1.48 MHz; MOD_OFFSET=0x20

centre

frequency=0.50 MHz.

6:0

MOD_DEV[6:0]

R/W

Modulator frequency deviation in 3.9062 kHz steps (0-500 kHz).

Unsigned value. Reset value gives a deviation of 250 kHz.

CC2400-RTR1 Datasheet(PDF) 60 Page - Texas Instruments

CC2400-RTR1 Datasheet(HTML) 60 Page - Texas Instruments

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