An interface device for serially writing programs to multiple MCUs

Abstract

The invention provides an interface device for serially writing programs in multiple MCUs (micro control units). Programs are written in the multiple MCUs through an external interface, work efficiency is improved, and hardware cost is saved. The interface device comprises a multi-way switch selection circuit, an isolating circuit and an interface conversion circuit. The input end of the multi-way switch selection circuit is connected with programming data lines of the MCUs. The output end of the multi-way switch selection circuit is sequentially connected with the isolating circuit and the interface conversion circuit. The multi-way switch selection circuit comprises a plurality of multi-way switches and a dial switch which controls the multi-way switches to gate one MCU. The dial switch controls the multi-way switches connected with data leads to gate one certain MCU to be programmed, controls the multi-way switches connected with data receiving lines and data transmitting lines to connect the data receiving lines and data transmitting lines of the gated MCU, and transits signals to the isolating circuit through the data receiving signals and the data transmitting signals; a communication interface of a computer is connected through the interface conversion circuit.

Description

technical field [0001] The invention relates to the technical field of chip program programming, in particular to an interface device for serially writing programs for a plurality of MCUs. Background technique [0002] With the continuous development of science and technology, the programming technology of MCU has changed from mask to chip writer, to online FLASH programming, and the latest ISP (in system programming) or IAP (in applying programming). In the stage of product development and small batch production, the program may be updated frequently or added functions according to user requirements, while the existing products only lead out the writing interface of the main MCU. To write a program, you can only disassemble the device. At present, some manufacturers export all the MCU programming interfaces. For example, if there are 5 MCUs in total, then 5 interfaces are respectively exported to write programs for the 5 MCUs. This has two disadvantages. First, it greatly...

AI Technical Summary

Problems solved by technology

This has two disadvantages. First, it greatly increases the hardware cost, because the programming interface needs to be isolated from the outside, and 5 interface circuits need 5 isolation circuits, and 5 interface conversion circuits (all output from the MCU are TTL level , if the computer interface needs to be converted to RS232 or USB)

Secondly, the terminal resources of the device are limited, and too many maintenance ports will reduce the alignment terminal resources of the device

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