Clock recovery system (CRS) (only valid for STM32L496xx/4A6xx devices) RM0351
280/1830 DocID024597 Rev 5
7.3 CRS functional description
7.3.1 CRS block diagram
Figure 21. CRS block diagram
7.3.2 Synchronization input
The CRS synchronization (SYNC) source, selectable through the CRS_CFGR register, can
be the signal from the LSE clock or the USB SOF signal. For a better robustness of the
SYNC input, a simple digital filter (2 out of 3 majority votes, sampled by the RC48 clock) is
implemented to filter out any glitches. This source signal also has a configurable polarity
and can then be divided by a programmable binary prescaler to obtain a synchronization
signal in a suitable frequency range (usually around 1 kHz).
For more information on the CRS synchronization source configuration, refer to
Section 7.6.2: CRS configuration register (CRS_CFGR).
It is also possible to generate a synchronization event by software, by setting the SWSYNC
bit in the CRS_CR register.
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