Non-shared stack storage processor

Abstract

The processor includes one CPU for processing data and instructions, one data memory for storing non-stack data and being used as temporary storage, one stack memory for storing stack data, one memory address pointer generator for generating the address for accessing the data memory, and one stack pointer generator for generating the pointer for accessing the stack memory.

Description

technical field [0001] The invention provides a processor, especially a processor with no shared stack memory. Background technique [0002] MCS (Micro Computer System) is Intel's general term for microprocessors, and the MCS-31 / 32 and 51 / 52 series processors developed by Intel are widely used in the industry. Generally speaking, a microprocessor only contains a small amount of memory and input and output points. Taking the MCS-51 series processor as an example, it has a program memory of 4K bytes, a data memory of 128 bytes, and 32 input and output points. The MCS-52 series processors increase the program memory to 8K bytes and the data memory to 256 bytes, while the MCS-31 / 32 and 51 / 52 series processors also use an 8-bit central processing unit unit. The program memory is used to store the program written by the user, which belongs to the read-only memory (ROM), and the data memory is the random access memory (RAM), which can be read or written by the central processing ...

AI Technical Summary

Problems solved by technology

However, due to the increasingly complex development of the system, the required stack memory and data memory have increased in a large amount. Although the data memory 12 can be expanded by using an external data memory, the size of the stack memory is still limited by the internal memory provided by the processor. data storage

Because the size of the stack memory is limited, in this way, complex programs often have insufficient stack memory, because the program must use the stack to record when calling the subroutine, but limited by the size of the stack memory, the program Then only a certain number of subroutines can be called. Furthermore, if parameters need to be passed in the subroutine, a large number of stacks need to be used.

In the case that the size of the stack memory cannot be expanded, the programmer must pay attention to the number of stacks used when writing the program, which makes the development of the program more difficult

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