Registers - Texas Instruments CC253x User Manual

Registers

24.1 Registers
The following status registers are available to the user:
RFSTAT (0x618D) RF Core Status
Bit Name
7 MOD_UNDERFLOW
6:5 DEM_STATUS
4 SFD
3 CAL_RUNNING
2 LOCK_STATUS
1 TX_ACTIVE
0 RX_ACTIVE
RFC_OBS_CTRL0 (0x61AE) RF Observation Mux Control 0
Bit Name
7 –
6
RFC_OBS_POL0
5:0 RFC_OBS_MUX0
RFC_OBS_CTRL1 (0x61AF) RF Observation Mux Control 1
Bit Name
7 –
6 RFC_OBS_POL1
5:0 RFC_OBS_MUX1
276
CC2540 and CC2541 Bluetooth low energy Radio
Reset R/W Description
0 R/W0 Modulator has underflowed. Must be cleared by software
00 R Demodulator status
00: Idle
01: Active
10: Finishing
11: Error
0 R High when the access address has been sent in TX or when sync has been
obtained in RX
0 R Frequency synth calibration status
0: Calibration done or not started
1: Calibration in progress
0 R 1 when PLL is in lock, otherwise 0
0 R Status signal, active when radio is in transmit state
0 R Status signal, active when radio is in receive state
Reset R/W Description
0 R0 Reserved. Read as 0
The signal chosen by RFC_OBS_MUX0 is XORed with this bit.
0 R/W
00 0000 R/W Controls which observable signal from rf_core is to be muxed out to
rfc_obs_sigs(0).
00 0000: 0 – Constant value
00 0001: 1 – Constant value
00 1001: TX active
00 1010: RX_active
11 0000: High from when receiver has found access address until packet is
finished, low otherwise
11 0001: High from when the access address has been transmitted until end of
packet, low otherwise
Other values reserved
Reset R/W Description
0 R0 Reserved. Read as 0
The signal chosen by RFC_OBS_MUX1 is XORed with this bit.
0 R/W
00 0000 R/W Controls which observable signal from rf_core is to be muxed out to
rfc_obs_sigs(1).
00 0000: 0 – Constant value
00 0001: 1 – Constant value
00 1001: TX active
00 1010: RX_active
11 0000: High from when receiver has found access address until packet is
finished, low otherwise
11 0001: High from when the access address has been transmitted until end of
packet, low otherwise
Other values reserved
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SWRU191F – April 2009 – Revised April 2014
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