'why not only one datasheet for STM microcontrollers [closed]

I know it's not a coding question , but I am struggling with something around my head for a little bit, for example stm32f446re : why it doesn't have only one datasheet , why so many datasheet for only one microcontroller , also my question is : how could I get all different possible datasheets for a specific microcontroller like stm32f446r4 Nucleo because I searched a lot but my instructor told me that there is about 6 different datasheets for stm32f446re , but what I could find is only 2 datasheets ?



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