Registers
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24.1 Registers
The following status registers are available to the user:
RFSTAT (0x618D) RF Core Status
Bit Name Reset R/W Description
7
MOD_UNDERFLOW
0 R/W0 Modulator has underflowed. Must be cleared by software
6:5
DEM_STATUS
00 R Demodulator status
00: Idle
01: Active
10: Finishing
11: Error
4
SFD
0 R High when the access address has been sent in TX or when sync has been
obtained in RX
3
CAL_RUNNING
0 R Frequency synth calibration status
0: Calibration done or not started
1: Calibration in progress
2
LOCK_STATUS
0 R 1 when PLL is in lock, otherwise 0
1
TX_ACTIVE
0 R Status signal, active when radio is in transmit state
0
RX_ACTIVE
0 R Status signal, active when radio is in receive state
RFC_OBS_CTRL0 (0x61AE) RF Observation Mux Control 0
Bit Name Reset R/W Description
7 – 0 R0 Reserved. Read as 0
6
RFC_OBS_POL0
0 R/W
The signal chosen by RFC_OBS_MUX0 is XORed with this bit.
5:0
RFC_OBS_MUX0
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 the access address has been transmitted until end of
packet, low otherwise
Other values reserved
RFC_OBS_CTRL1 (0x61AF) RF Observation Mux Control 1
Bit Name Reset R/W Description
7 – 0 R0 Reserved. Read as 0
6
RFC_OBS_POL1
0 R/W
The signal chosen by RFC_OBS_MUX1 is XORed with this bit.
5:0
RFC_OBS_MUX1
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 the access address has been transmitted until end of
packet, low otherwise
Other values reserved
288
CC2540/CC2541 Bluetooth low energy Radio SWRU191C–April 2009–Revised January 2012
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