Microcontroller peripheral expansion method based on dual buses

Abstract

The invention discloses a microcontroller peripheral expansion method based on dual buses, which comprises the following steps that: (1) an off-chip register bus and an off-chip data memory bus are configured; (2) register modules are respectively added to the off-chip register bus and the off-chip data memory bus; (3) port registers which are connected with the periphery are configured in the register modules; (4) address spaces are distributed for the port registers; (5) the periphery is connected with the register modules; and (6) a peripheral driving program is prepared. The dual-bus peripheral expansion method adopts different bus expansion for the nature of different peripheral ports so that the advantages of the two buses are fully displayed, adopts high-speed off-chip register bus expansion for a control port register and a state port register with quite high requirement on the speed, and adopts off-chip data peripheral memory bus expansion with ample address space for a data register with quite a lot of occupied address space.

Description

technical field [0001] The invention relates to the technical field of microcontroller peripheral expansion, in particular to a dual-bus-based microcontroller peripheral expansion method based on the combination of an off-chip register bus and an off-chip data memory bus. Background technique [0002] A microcontroller (MCU, Micro Control Unit) is a microcomputer that integrates a central processing unit (CPU), a certain capacity of memory, and a number of input / output ports on a small silicon chip, also known as a single-chip microcomputer. Since the microcontroller came out in the 1970s, it has been widely used in scientific research, production, life and other fields, and has had a great impact on the development of human society. In particular, the MCS-51 series microcontrollers produced by Intel Corporation of the United States quickly occupied industrial measurement and control and automation engineering due to their advantages such as high integration, strong processi...

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Problems solved by technology

[0004] The disadvantage of this expansion method is that the peripheral access speed is slow, because the instruction MOVX to access the off-chip data memory takes a long time to execute, and at the same time, its expansion capability is limited. When there are a large number of peripherals that need to be expanded, the expansion work will become extremely complicated.

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