CC1020-RTR1 datasheet(71/91 Pages) TI

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CC1020

SWRS046

Page 71 of 92

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

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