CC1021-RTR1 datasheet(70/92 Pages) TI

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CC1021

SWRS045

Page 70 of 91

CLOCK_B Register (0Bh)

NAME

Default

value

Active

Description

CLOCK_B[7:5]

REF_DIV_B[2:0]

Reference frequency divisor (B):

0: Not supported

1: REF_CLK frequency = Crystal frequency / 2

7: REF_CLK frequency = Crystal frequency / 8

CLOCK_B[4:2]

MCLK_DIV1_B[2:0]

Modem clock divider 1 (B):

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_B[1:0]

MCLK_DIV2_B[1:0]

Modem clock divider 2 (B):

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.

VCO Register (0Ch)

NAME

Default

value

Active

Description

VCO[7:4]

VCO_CURRENT_A[3:0]

Control of current in VCO core for frequency A

0: 1.4 mA current in VCO core

1: 1.8 mA current in VCO core

2: 2.1 mA current in VCO core

3: 2.5 mA current in VCO core

4: 2.8 mA current in VCO core

5: 3.2 mA current in VCO core

6: 3.5 mA current in VCO core

7: 3.9 mA current in VCO core

8: 4.2 mA current in VCO core

9: 4.6 mA current in VCO core

10: 4.9 mA current in VCO core

11: 5.3 mA current in VCO core

12: 5.6 mA current in VCO core

13: 6.0 mA current in VCO core

14: 6.4 mA current in VCO core

15: 6.7 mA current in VCO core

Recommended setting: VCO_CURRENT_A=4

VCO[3:0]

VCO_CURRENT_B[3:0]

Control of current in VCO core for frequency B

The current steps are the same as for

VCO_CURRENT_A

Recommended setting: VCO_CURRENT_B=4

CC1021-RTR1 Datasheet(PDF) 70 Page - Texas Instruments

CC1021-RTR1 Datasheet(HTML) 70 Page - Texas Instruments

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