Single bus data communication method

Abstract

The invention relates to a single-bus data communication method. The master generates a low-level pulse greater than the power-on reset time on the Single-Line signal in the working state as the communication power-on reset pulse; the slave machine completes the execution within the power-on reset time Power-on reset; and generate a low-level reset completion signal with programmable adjustable width as a response pulse; the host detects the signal value and obtains the reference frequency of the slave; the host adjusts its own reference frequency to synchronize with the communication rate of the slave. The present invention greatly improves the reliability and flexibility of sampling in the communication operation of the master, thereby improving the reliability of the system; because the reference frequency of the master and the slave can be predicted, the frequency and range of the data communication system can be precisely defined, so that the The data communication system rate is expanded within the frequency band, from the original single communication rate to the programmable and adjustable communication rate, which greatly improves the system function; makes the circuit logic operation simple and easy.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a single-bus data communication method. Background technique [0002] Unlike most current standard serial data communication methods, such as SPI / I2C / MICROWIRE, the Single-Line single-bus protocol uses a single signal line, which not only transmits the clock signal of the serial data bit, but also transmits the serial data, and the data transmission is two-way. most The device does not need an additional power supply, and can directly obtain sufficient power supply current from the single bus (that is, the parasitic power supply mode). It has many advantages such as saving I / O port line resources, simple structure, low cost, and convenient for bus expansion and maintenance. [0003] The Single-Line single-bus protocol is suitable for a single host system, which can control one or more Single-Line devices on a Single-Line single bus. When there is only one Single-Line d...

AI Technical Summary

Problems solved by technology

However, the current single-bus communication method does not have the communication rate synchronization function, so that a wide range of communication system rates is used to compensate for the uncertainty and unknowability of the master and slave reference frequencies, so it can only operate at a single communication rate

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