EFM8BB3 Datasheet, PDF (67/70 Pages) Silicon Laboratories – The EFM8BB3 device family are fully integrated, mixed-signal system-on-a-chip MCUs. Highlighted features are listed below

11. Revision History
11.1 Revision 0.1
Initial release.
11.2 Revision 0.2
Added information on the bootloader to 3.10 Bootloader.
Updated some characterization TBD values.
EFM8BB3 Data Sheet
Revision History
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Preliminary Rev. 0.2 | 66