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Registers
FREQTUNE (0x618E) – Crystal Oscillator Frequency Tuning
Bit Reset Description
Name R/W
No.
7:4 – 0x0 R0 Read as zero
3:0
XOSC32M_TUNE[3:0]
0xF R/W Tune crystal oscillator
The default setting, 1111, leaves the XOSC not tuned. Changing the
setting from default switches in extra capacitance to the oscillator,
effectively lowering the XOSC frequency. Hence, a higher setting gives
a higher frequency.
TXPOWER (0x6190) – Controls the Output Power
Bit Reset
Name R/W Description
No.
7:0
PA_POWER [7:0]
0xF5 R/W PA power control.
NOTE: Before going to TX, this value should be updated. Please
consult the device's data sheet (Appendix C) for recommended values;
see also Section 23.8.13.
TXCTRL (0x6191) – Controls the TX Settings
Bit Name Reset R/W Description
No.
7 – 0 R0 Reserved
6:4
DAC_CURR[2:0]
110 R/W Change the current in the DAC.
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.
FSMSTAT0 (0x6192) – Radio Status Register
Bit Reset
Name R/W Description
No.
7 – 0 R Reserved
6
CAL_RUNNING
0 R Frequency synthesizer calibration status
0: Calibration done or not started
1: Calibration in progress
5:0
FSM_FFCTRL_STATE[5:0]
– R Gives the current state of the FIFO and frame-control (FFCTRL) finite-state
machine.
273
SWRU191C–April 2009–Revised January 2012 CC253x Radio
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