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Meaning: USR_Stack_Size and Stack_Top

Hello,

could anybody tell me the information of this code line

Stack_Mem SPACE USR_Stack_Size
__initial_sp SPACE ISR_Stack_Size

Stack_Top

__initial_sp is the whole stack size - that's clear. But which information has the last code line Stack_Top? And why is the USR_Stack_Size in comparison to the other Stack_Sizes so big?

best wishes
Tina

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