CC1021 datasheet(71/94 Pages) TI

71 / 94 page

CC1021

SWRS045C

Page 71 of 87

MODEM Register (0Dh)

NAME

Default

value

Active

Description

MODEM[7]

Reserved, write 0

MODEM[6:4]

ADC_DIV[2:0]

ADC clock divisor

0: Not supported

1: ADC frequency = XOSC frequency / 4

2: ADC frequency = XOSC frequency / 6

3: ADC frequency = XOSC frequency / 8

4: ADC frequency = XOSC frequency / 10

5: ADC frequency = XOSC frequency / 12

6: ADC frequency = XOSC frequency / 14

7: ADC frequency = XOSC frequency / 16

Note that the intermediate frequency should be as close

to 307.2 kHz as possible. ADC clock frequency is always

4 times the intermediate frequency and should therefore

be as close to 1.2288 MHz as possible.

MODEM[3]

Reserved, write 0

MODEM[2]

PN9_ENABLE

Enable scrambling of TX and RX with PN9 pseudo-

random bit sequence

0: PN9 scrambling is disabled

1: PN9 scrambling is enabled (x

9+x5+1)

The PN9 pseudo-random bit sequence can be used for

BER testing by only transmitting zeros, and then

counting the number of received ones.

MODEM[1:0]

DATA_FORMAT[1:0]

Modem data format

0 (00): NRZ operation

1 (01): Manchester operation

2 (10): Transparent asynchronous UART operation, set

DCLK=0

3 (11): Transparent asynchronous UART operation, set

DCLK=1

DEVIATION Register (0Eh)

NAME

Default

value

Active

Description

DEVIATION[7]

TX_SHAPING

Enable Gaussian shaping of transmitted data

Recommended setting: TX_SHAPING=1

DEVIATION[6:4]

TXDEV_X[2:0]

Transmit frequency deviation exponent

DEVIATION [3:0]

TXDEV_M[3:0]

Transmit frequency deviation mantissa

Deviation in 402-470 MHz band:

FREF ·TXDEV_M ·2

(TXDEV_X−16)

Deviation in 804-960 MHz band:

FREF ·TXDEV_M ·2

(TXDEV_X−15)

On-off-keying (OOK) is used in RX/TX if TXDEV_M[3:0]=0

To find TXDEV_M given the deviation and TXDEV_X:

TXDEV_M = deviation·2

(16−TXDEV_X)/FREF

in 402-470 MHz band,

TXDEV_M = deviation·2

(15−TXDEV_X)/FREF

in 804-960 MHz band.

Decrease TXDEV_X and try again if TXDEV_M

< 8.

Increase TXDEV_X and try again if TXDEV_M

≥ 16.

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