Registers
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FREQCTRL (0x6184) – Synthesizer Frequency Control
Bit
Name Reset R/W Description
No.
7 – 0 R0 Reserved. Read as zero
6:0
FREQ[6:0]
0x16 R/W Frequency control word. Controls frequency of local oscillator. See
Section 25.5 for the relation between the LO frequency and the RF
frequency.
ƒ
LO
= (2379 + FREQ[6:0]) MHz
The frequency word in FREQ[6:0] is an offset value from 2379 MHz. The
device supports the frequency range from 2379 MHz to 2495 MHz. The
usable settings for FREQ[6:0] are consequently 0 to 116. Settings outside
this range (117–127) give a frequency of 2495 MHz.
FREQTUNE (0x6185) – Crystal Oscillator Frequency Tuning
Bit
Name Reset R/W Description
No.
7:4 – 0x0 R0 Reserved. Read as zero
3:0
XOSC32M_TUNE[3:0]
0xF R/W Tune crystal oscillator. The default setting of 1111 leaves the XOSC not
tuned. Changing setting from default switches in extra capacitance to the
oscillator, effectively lowering the XOSC frequency. Hence, a higher
setting gives a higher frequency.
TXPOWER (0x6186) – Output Power Control
Bit
Name Reset R/W Description
No.
7:0
PA_POWER[7:0]
0xF5 R/W PA power control. NOTE: This value should be updated. See the device
data sheet (Appendix C) for recommended values.
TXCTRL (0x6187) – Tx Settings
Bit
Name Reset R/W Description
No.
7 – 0 R0 Reserved
6 – 1 R/W Reserved
5:4
DAC_CURR[1:0]
10 R/W Change the current in the DAC to change the current steps
3:2
DAC_DC[1:0]
10 R/W Adjusts the dc level to the Tx mixer.
1:0
TXMIX_CURRENT[1:0]
01 R/W Transmit mixers core current: Current increases with increasing setting.
LLESTAT (0x6188) – LLE Status
Bit
Name Reset R/W Description
No.
7:5 – 000 R0 Reserved
4
AGC_LOWGAIN
0 R 1 if the AGC algorithm has reduced the front-end gain; 0 otherwise
3
WAIT_T2E1
0 R Indication on the LLE waiting for Timer 2 event 1 to start a task
0: Not waiting for Timer 2 event 1
1: Command processed, event 1 not yet received
2
LLE_IDLE
0 R Link-layer engine idle
0: The LLE is busy processing or finishing a command, or in reset.
1: The LLE is idle waiting for a command to start a new task.
1
SYNC_SEARCH
0 R Rx search for sync
0: The modem is not ready to receive a packet
1: The modem is in search for a sync word or is receiving a packet
0
VCO_ON
0 R VCO on
0: The VCO is powered down, so the next Rx or Tx operation must start
and calibrate the synthesizer before transmitting or receiving
1: The VCO is powered up. If the LLE is idle, it means the next task starts
quickly if frequency programming is disabled (PRF_CHAN.FREQ =
127)
338
CC2541 Proprietary Mode Radio SWRU191C– April 2009–Revised January 2012
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Copyright © 2009–2012, Texas Instruments Incorporated
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