CC112X/CC1175
SWRU295C
Page 6 of 108
Transmit mode
Receive mode
IDLE
Manual freq.
synth. calibration
RX FIFO
ERROR
TX FIFO
ERROR
Frequency
synthesizer on
SFSTXON
SRX or wake-on-radio (WOR)
STX
STX
STX or RXOFF_MODE=10
RXOFF_MODE = 00
SFTX
SRX or TXOFF_MODE = 11
SIDLE
SCAL
SFRX
IDLE
TXOFF_MODE = 00
SFSTXON or RXOFF_MODE = 01
SRX or STX or SFSTXON or wake-on-radio (WOR)
SLEEP
SPWD or wake-on-radio (WOR)
Crystal
oscillator off
SXOFF
CSn = 0
CSn = 0
TXOFF_MODE = 01
Frequency
synthesizer startup,
optional calibration,
settling
Optional freq.
synth. calibration
Default state when the radio is not
receiving or transmitting.
Lowest power mode. Most
register values are retained
(see Table 5 for details ).
All register values are
retained.
Used for calibrating frequency
synthesizer upfront (entering
receive or transmit mode can
then be done quicker).
Transitional state.
Frequency synthesizer is turned on, can optionally be
calibrated, and then settles to the correct frequency.
Transitional state.
Frequency synthesizer is on,
ready to start transmitting.
Transmission starts very
quickly after receiving the STX
command strobe.
Optional transitional state.
In FIFO-based modes,
transmission is turned off and
this state entered if the TX
FIFO becomes empty in the
middle of a packet.
In FIFO-based modes,
reception is turned off and this
state entered if the RX FIFO
overflows.
SRX
Figure 2: Simplified State Diagram
2
Configuration Software
CC112X
can be configured using the SmartRF
™ Studio software [1]. SmartRF Studio is highly
recommended for obtaining optimum register settings, and for evaluating performance and
functionality.
After chip reset, all registers have default values and these might differ from the optimum register
setting. It is therefore necessary to configure/reconfigure the radio through the SPI interface after the
chip has been reset. SmartRF Studio provides a code export function making it easy to implement this
in firmware.