Unibus data communication method

A data communication, single-bus technology, applied in the field of communication, can solve problems such as single, no communication rate synchronization function, etc., achieve low power consumption, simple and easy circuit logic operation, and improve reliability and flexibility.

Active Publication Date: 2015-05-27
JIANGSU RUIWEI ELECTRONICS
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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

Method used

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Embodiment Construction

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the structures related to the present invention.

[0026] The Single-Line bus system consists of a single bus master and one or more slave devices. In any case, the bus master is usually a microcontroller. The Single-Line protocol works according to the state of the bus in specific time slots that begin with the falling edge of a sync pulse sent by the bus master. Since the Single-Line bus system has only one data line, in order to make the above operations easy to implement, each device on the bus needs to have an open-drain or tri-state output port, while the Single-Line port of the slave device uses an open-drain output. .

[0027] The idle state of the Single-Line bus is high...

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Abstract

The invention relates to a unibus data communication method. The method comprises the steps of generating a low level pulse which is greater than power on reset time as a communicating power on reset pulse on a Single-Line signal in an operating state by a host; implementing and completing power on reset during the power on reset time by a slave; generating a low level reset completion signal capable or programming a controllable width as a response pulse; detecting a signal value and obtaining the reference frequency of the slave by the host; regulating the reference frequency to be synchronous to the communication speed of the slave by the host. According to the method provided by the invention, the sampling reliability and flexibility of the host can be greatly improved during communication operation, and the reliability of the system can be improved; furthermore, due to the reference frequencies of the host and the slave, the frequency and scope of a data communication system can be precisely and predictably defined to expand the speed of a data communication system in a limit frequency band scope; meanwhile, the primary single communication speed can be promoted to the programmable regulatory transmission speed, therefore the functions of the system can be improved; in addition, the logic operation of the circuit is simple and feasible.

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 serial data, and the data transmission is bidirectional. most The device does not require an additional power supply, and can obtain sufficient supply current directly from the single bus (ie, parasitic power supply). It has many advantages such as saving I / O port line resources, simple structure, low cost, convenient bus expansion and maintenance. [0003] The Single-Line single bus protocol is suitable for a single host system and can control one or more Single-Line devices on a Single-Line single bus. When only one Single-Line device is located on the bus, the sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/38
Inventor 韩勇
Owner JIANGSU RUIWEI ELECTRONICS
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