Serial communication method and apparatus

Abstract

The invention discloses a method of serial communication, wherein, master equipment is connected with a plurality of slave equipments; the master equipment provides a communication clock signal (CLK) to the slave equipment by a clock signal wire, notifies the slave equipment to start reading / writing operation by a synchronous signal (SYN), and transmits a slave equipment address or a register address to the slave equipment by a downstream data signal (CMD); and the master equipment transmits downstream data to the slave equipment by the downstream data signal (CMD), or the slave equipmen transmits upstream data to the master equipment by an upstream data signal (DAT). The method of serial communication comprises a serial communication method of the master equipment, a serial communication method of the slave equipment and a serial communication method for interaction of the master equipment and the slave equipment. The invention also discloses the master equipment and the slave equipment. The proposal of the invention has the advantages of easy realization, pin resource conservation and cost reduction.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a serial communication method and device. Background technique [0002] In electronics, the cost of a complete system is often influenced by its internal interconnection bus structure. Generally, interconnection bus structures are divided into parallel and serial types. [0003] A parallel bus or a serial bus generally consists of data lines, address lines, control lines, and the like. Parallel bus design is simple to achieve, easy to achieve a higher communication rate, which has been widely used. However, the parallel communication method requires more signal lines, takes up more chip pin resources and circuit board design space, and generally requires a larger number of devices. Therefore, this method is generally not used in systems with tight pin resources, limited board space, and cost-sensitive systems. Serial bus communication requires only few interconnec...

AI Technical Summary

Problems solved by technology

This will take up more pin resources of the main device, and the internal interconnection lines of the PCB will also increase accordingly, which will increase the product development cost and reduce the reliability of the system; One slave device requires the master device to allocate an additional chip select signal, which can only be achieved by modifying the hardware design

In addition, since the SPI protocol does not provide a fault diagnosis mechanism, the system cannot provide corresponding solutions when one of the communication parties fails

[0010] To sum up, the existing commonly used serial communication methods have certain defects and cannot well meet the needs of practical applications.

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