Stack pointer, Electrical Engineering

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stack Pointer (SP)

It is also a 16 bit  register and a  memory  pointer similar to  program counter. It holds  the memory  address of the  top of the stack. Stack is a  part of  the memory used to  store  data temporarily  especially  while execution of subroutine.  Data  stored  last is  read  first  in the  stack i e last in first  out ( LIFO).  The use of stack  pointer will be explained in more detail in chapter5.


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POP Instruction This instruction  copies the contents  of the top  two locations  of the  stack into the  specified  register pair. The  contents  of stack pointer register are

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