CC2420Z-RTR1 datasheet(78/92 Pages) TI

78 / 92 page

CC2420

SWRS041B

Page 78 of 89

FSTST3 (0x2A) - Frequency Synthesizer Test Register 3

Bit

Field Name

Reset

R/W

Description

CHP_CAL_DISABLE

R/W

Disable charge pump during VCO calibration when set.

CHP_CURRENT_OE

R/W

Charge pump current override enable

0 : Charge pump current set by calibration

1 : Charge pump current set by START_CHP_CURRENT

CHP_TEST_UP

R/W

Forces the CHP to output "up" current when set

CHP_TEST_DN

R/W

Forces the CHP to output "down" current when set

CHP_DISABLE

R/W

Set to manually disable charge pump by masking the up and

down pulses from the phase-detector.

PD_DELAY

R/W

Selects short or long reset delay in phase detector:

0: Short reset delay

1: Long reset delay

9:8

CHP_STEP_PERIOD[1:0]

R/W

The charge pump current value step period:

0: 0.25 us

1: 0.5 us

2: 1 us

3: 4 us

7:4

STOP_CHP_CURRENT[3:0]

R/W

The charge pump current to stop at after the current is stepped

down from START_CHP_CURRENT after VCO calibration is

complete. The current is stepped down periodically with intervals

as defined in CHP_STEP_PERIOD.

3:0

START_CHP_CURRENT[3:0]

R/W

The charge pump current to start with after VCO calibration is

complete. The current is then stepped down periodically to the

value STOP_CHP_CURRENT with intervals as defined in

CHP_STEP_PERIOD.

Also used for overriding the charge pump current when

CHP_CURRENT_OE=’1’

RXBPFTST (0x2B) - Receiver Bandpass Filters Test Register

Bit

Field Name

Reset

R/W

Description

Reserved, write as 0.

RXBPF_CAP_OE

R/W

RX bandpass filter capacitance calibration override enable.

13:7

RXBPF_CAP_O[6:0]

R/W

RX bandpass filter capacitance calibration override value.

6:0

RXBPF_CAP_RES[6:0]

RX bandpass filter capacitance calibration result.

0: Minimum capacitance in the feedback.

1: Second smallest capacitance setting.

…

127: Maximum capacitance in the feedback.

FSMSTATE (0x2C) - Finite state machine information

Bit

Field Name

Reset

R/W

Description

15:6

Reserved, write as 0.

5:0

FSM_CUR_STATE[5:0]

Provides the current state of the FIFO and Frame Control

(FFCTRL) finite state machine. See the Radio control state

machine section on page 43 for details.

CC2420Z-RTR1 데이터시트(PDF) 78 Page - Texas Instruments

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