Hello @eben .1 and welcome to the community :) ,
The STM32WB5MMG based on the STM32WB55VGY microcontroller and shared the same reference manual (RM0434).
So, you can found the registers information in this reference manual.
Also, I advise you to refer to the errata sheet for the STM32WB5MMG.
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Kaouthar
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