The stack is a special group in the memory. A continuous storage area is specially set aside in the internal RAM to temporarily store subroutine breakpoint addresses, interrupt breakpoint addresses and other data that need to be saved.
Whether it is storing or retrieving data, the stack operation can only be done in sequence, and it cannot be offside. It must follow the principle of "first in, last out" or "last in, first out".
The stack pointer SP indicates the address of the top storage unit of the stack.
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