CC1021 datasheet(76/94 Pages) TI

76 / 94 page

CC1021

SWRS045C

Page 76 of 87

LOCK Register (15h)

NAME

Default

value

Active

Description

LOCK[7:4]

LOCK_SELECT[3:0]

Selection of signals to LOCK pin

0: Set to 0

1: Set to 1

2: LOCK_CONTINUOUS (active low)

3: LOCK_INSTANT (active low)

4: CARRIER_SENSE (RSSI above threshold, active low)

5: CAL_COMPLETE (active low)

6: SEQ_ERROR (active low)

7: FXOSC

8: REF_CLK

9: FILTER_CLK

10: DEC_CLK

11: PRE_CLK

12: DS_CLK

13: MODEM_CLK

14: VCO_CAL_COMP

15: F_COMP

LOCK[3]

WINDOW_WIDTH

Selects lock window width

0: Lock window is 2 prescaler clock cycles wide

1: Lock window is 4 prescaler clock cycles wide

Recommended setting: WINDOW_WIDTH=0.

LOCK[2]

LOCK_MODE

Selects lock detector mode

0: Counter restart mode

1: Up/Down counter mode

Recommended setting: LOCK_MODE=0.

LOCK[1:0]

LOCK_ACCURACY[1:0]

Selects lock accuracy (counter threshold values)

0: Declare lock at counter value 127, out of lock at value 111

1: Declare lock at counter value 255, out of lock at value 239

2: Declare lock at counter value 511, out of lock at value 495

3: Declare lock at counter value 1023, out of lock at value

1007

Note: Set LOCK_SELECT=2 to use the LOCK pin as a lock indicator.

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