Texas Instruments CC2541EMK User Manual

www.ti.com Registers
SEMAPHORE0 (0x618A) – Semaphore for Accessing RF Data Memory
Bit
Name Reset R/W Description
No.
7:1 – 0000 R0 Reserved, read as 0
000
0
SEMAPHORE
1 R/W1
When SEMAPHORE = 1 and SEMAPHORE0 is read, SEMAPHORE is
set to 0. SEMAPHORE can only be set to 1 by a reset or by writing 1 to
it.
SEMAPHORE1 (0x618B) – Semaphore for Accessing RF Data Memory
Bit
Name Reset R/W Description
No.
7:1 – 0000 R0 Reserved, read as 0
000
0
SEMAPHORE
1 R/W1
When SEMAPHORE = 1 and SEMAPHORE1 is read, SEMAPHORE is
set to 0. SEMAPHORE can only be set to 1 by a reset or by writing 1 to
it.
SEMAPHORE2 (0x618C) – Semaphore
Bit
Name Reset R/W Description
No.
7:1 – 0000 R0 Reserved, read as 0
000
0 1 R/W1
SEMAPHORE When SEMAPHORE = 1 and SEMAPHORE2 is read, SEMAPHORE is
set to 0. SEMAPHORE can only be set to 1 by a reset or by writing 1 to
it.
RFSTAT (0x618D) – RF Core Status
Bit
Name Reset R/W Description
No.
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 sync word has been sent in TX or when sync has been
obtained in RX
3
CAL_RUNNING
0 R Frequency synthesizer calibration status.
0: Calibration done or not started
1: Calibration in progress.
2
LOCK_STATUS
0 R 1 when PLL is in lock; 0 otherwise
1
TX_ACTIVE
0 R Status signal, active when the LLE is in one of the transmit states
0
RX_ACTIVE
0 R Status signal, active when the LLE is in one of the receive states
RSSI (0x618E) – Received Signal Strength Indicator
Bit
Name Reset R/W Description
No.
7:0
RSSI_VAL[7:0]
0x80 R RSSI estimate on a logarithmic scale. Unit is 1 dB; offset depends on the
gain of the Rx chain, including external components; see the device data
sheet. The reset value of 0x80 also indicates that the RSSI value is
invalid/measurement not yet complete.
RFPSRND (0x618F) – Pseudorandom Number Generator
Bit
Name Reset R/W Description
No.
7:0
RNG_DOUT[7:0]
0x00 R The value read from the pseudorandom number generator, see
Chapter 14. Reading this register generates causes the shift register to be
updated with 13 times rollout.
339
SWRU191C–April 2009–Revised January 2012 CC2541 Proprietary Mode Radio
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Texas Instruments CC2541EMK Specifications

General

Brand	Texas Instruments
Model	CC2541EMK
Category	Microcontrollers
Language	English