Singlechip adopting RISC structure

Abstract

The invention discloses a singlechip that supports MCS-51 instruction set, which comprises a ROM, an instruction fetching module, a RAM, an arithmetic logic unit, a special function register and a decoding module, and the like, adopts the way of an instruction with equal length, and adds a 3 lever pipeline function. The ROM is used for storing the application program of a user; the instruction fetching module provides the value of a program counter PC to the ROM and reads the application program from the ROM, thereby finishing the instruction fetching of the pipeline operation in a first phase, and then decomposes the application program into the operation code and operand which are transmitted to the decoding module; after the interruption module receives the interruption signal, the interruption response signal is returned. The decoding module fetches the operation code and operand to be implemented from the instruction fetching module, determines the control signal to other modules according to the operation code, and then finish a second phase and a third phase of the pipeline operation. On the condition that the instruction system of the MCS-51 series single-chip remains unchanged, the speed for the operation of the instruction can be improved effectively.

Description

technical field [0001] The invention relates to a single-chip microcomputer, in particular to a single-chip microcomputer adopting a RISC (Reduced Instruction Set Computer) structure, and the single-chip computer supports MCS-51 series single-chip computer instructions. Background technique [0002] Single-chip microcomputer, referred to as single-chip microcomputer, is an important branch of microcomputer, and it is also a very active and vigorous model. Single-chip microcomputer is especially suitable for the field of control, so it is also called microcontroller. [0003] MCS-51 series single-chip microcomputer is an 8-bit single-chip microcomputer launched by Intel Corporation, which is widely used in embedded systems and equipment manufacturing industries. With the rapid development of the electronic industry, various industries have higher and higher requirements for the operating speed of single-chip microcomputers, and the traditional MCS-51 single-chip microcompute...

AI Technical Summary

Problems solved by technology

[0012] The operating speed of the MCS-51 series single-chip microcomputer is due to the fixed timing of the instruction fetching phase and the executing instruction phase, so it is difficult to increase its operating speed, which cannot adapt to the development of modern technology and meet the needs of industrial control systems for increasing the operating speed of single-chip microcomputers.

[0013] To increase the operating speed of the existing MCS-51 series single-chip microcomputers, it is also possible to use the RISC structure to change the instruction system, but people cannot use the program resources of the previous MCS-51 series single-chip microcomputers, and must be familiar with the new instruction system

Therefore, under the condition that people are already familiar with the MCS-51 series single-chip instruction system, it is not conducive to the compatibility and popularization and application of existing technologies.

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