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This article mainly introduces the computer network in the programming to re-assign the value of sp what is the reason, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor with you to understand.

Reason: after the system is reset, the SP content is 07H; if it is not redefined, the bottom of the stack is 07H, and the contents of the stack are stored from the 08H unit; if you need to use a deeper stack, it will affect the use of the working register.

The operating environment of this tutorial: windows10 system, Dell G3 computer.

A stack is the first-in-first-out or last-in-first-out area of the internal data RAM area. It has two specific functions: protecting the breakpoint and protecting the site.

The stack indicator (SP) is an 8-bit register that holds the address of the memory unit at the top of the current stack. When data is stored on or fetched from the stack, the contents of the stack indicator are automatically incremented or decremented as part of the execution of stack operation instructions.

Why do you reassign SP when you are programming?

After the system is reset, the SP content is 07H. If it is not redefined, the bottom of the stack is 07H, and the contents of the stack are stored from the 08H unit; if you need to use a deeper stack, it will affect the use of the working register. Therefore, it is necessary to re-assign the SP so that the stack area is set in a blank area in the on-chip data RAM area, and the stack depth is limited to no more than the on-chip RAM space.

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