CC1020 datasheet(70/91 Pages) TI

Part #	CC1020

Description	Single Chip Low Power RF Transceiver for Narrowband Systems

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CC1020

SWRS046

Page 70 of 92

CLOCK_A Register (07h)

REGISTER

NAME

Default

value

Active

Description

CLOCK_A[7:5]

REF_DIV_A[2:0]

2

-

Reference frequency divisor (A):

0: Not supported

1: REF_CLK frequency = Crystal frequency / 2

…

7: REF_CLK frequency = Crystal frequency / 8

It is recommended to use the highest possible reference

clock frequency that allows the desired Baud rate.

CLOCK_A[4:2]

MCLK_DIV1_A[2:0]

4

-

Modem clock divider 1 (A):

0: Divide by 2.5

1: Divide by 3

2: Divide by 4

3: Divide by 7.5 (2.5·3)

4: Divide by 12.5 (2.5·5)

5: Divide by 40 (2.5·16)

6: Divide by 48 (3·16)

7: Divide by 64 (4·16)

CLOCK_A[1:0]

MCLK_DIV2_A[1:0]

0

-

Modem clock divider 2 (A):

0: Divide by 1

1: Divide by 2

2: Divide by 4

3: Divide by 8

MODEM_CLK frequency is FREF frequency divided by

the product of divider 1 and divider 2.

Baud rate is MODEM_CLK frequency divided by 8.

FREQ_2B Register (08h)

REGISTER

NAME

Default

value

Active

Description

FREQ_2B[7:0]

FREQ_B[22:15]

131

-

8 MSB of frequency control word B

FREQ_1B Register (09h)

REGISTER

NAME

Default

value

Active

Description

FREQ_1B[7:0]

FREQ_B[14:7]

189

-

Bit 15 to 8 of frequency control word B

FREQ_0B Register (0Ah)

REGISTER

NAME

Default

value

Active

Description

FREQ_0B[7:1]

FREQ_B[6:0]

124

-

7 LSB of frequency control word B

FREQ_0B[0]

DITHER_B

1

H

Enable dithering for frequency B

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