Bpsk Framing; Sub-Ghz Radio Data Buffer; Figure 14. Sub-Ghz Ram Data Buffer Operation - ST STM32WL55JC Reference Manual

Sub-GHz radio (SUBGHZ)
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Calibration mode
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Standby mode
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Active mode (FS, TX, RX)
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The sub-GHz radio operating modes are shown in the figure below.
170/1454
RC 64 kHz and timers can be kept running (optional)
Optional registers and data memory retained
intermediate mode between Deep-Sleep or Sleep, and Standby
used to calibrate the sub-GHz radio RC 64 kHz, sub-GHz radio RC 13 MHz, RF-
PLL, RF-ADC and image
sub-GHz radio clocked by its internal RC 13 MHz clock
HSE32 clock can be kept running (optional)
data memory retained
Frequency synthesis (FS) mode: RF-PLL switched on
Transmit (TX) mode: the power amplifier (PA) ramped and data transmitted from
the data buffer according the selected modulation scheme
Receive (RX) mode: sub-GHz radio looking for incoming data packets
Figure 15. Sub-GHz radio operating modes
POR and reset
TxTimeout,
TxDone
Set_Tx()
Set_Tx()
Startup
Sleep
NSS or RF-RTC (cold)
Calibration
Calibration done
Standby
Set_Standby()
Set_Fs()
Set_Tx()
Set_Fs()
FS
Set_Rx()
Set_Tx()
TX
Active
RM0453 Rev 2
Set_Sleep()
NSS or RF-RTC (warm)
RxTimeout,
RxDone,
Set_Standby()
Set_Rx()
Set_Fs()
Set_Rx()
RX
Set_Rx()
RM0453
MSv62622V2