Texas Instruments 3138 155 232931 - Manual (Page 78)

CC2420
SWRS041B Page 78 of 89
FSTST3 (0x2A) - Frequency Synthesizer Test Register 3
Bit Field Name Reset R/W Description
15 CHP_CAL_DISABLE 1 R/W Disable charge pump during VCO calibration when set.
14 CHP_CURRENT_OE 0 R/W Charge pump current override enable
0 : Charge pump current set by calibration
1 : Charge pump current set by START_CHP_CURRENT
13 CHP_TEST_UP 0 R/W Forces the CHP to output "up" current when set
12 CHP_TEST_DN 0 R/W Forces the CHP to output "down" current when set
11 CHP_DISABLE 0 R/W Set to manually disable charge pump by masking the up and
down pulses from the phase-detector.
10 PD_DELAY 0 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] 2 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] 13 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] 13 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
15 - 0 W0 Reserved, write as 0.
14 RXBPF_CAP_OE 0 R/W RX bandpass filter capacitance calibration override enable.
13:7 RXBPF_CAP_O[6:0] 0 R/W RX bandpass filter capacitance calibration override value.
6:0 RXBPF_CAP_RES[6:0] 0 R 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 - 0 W0 Reserved, write as 0.
5:0 FSM_CUR_STATE[5:0] 0 R 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.