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Serial communication method and interface circuit

A technology of serial communication and interface circuit, applied in the field of serial communication, can solve problems such as poor anti-interference ability, and achieve the effect of enhancing anti-interference ability

Active Publication Date: 2007-01-10
HAIER GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problem of poor anti-interference ability caused by distinguishing data 0 and data 1 by time threshold in serial communication

Method used

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  • Serial communication method and interface circuit

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Experimental program
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Embodiment Construction

[0029] The flow process of the serial communication method of the present invention is as figure 1 shown.

[0030] In step S010, the data sent / received each time is regarded as one frame, and the sequence and meaning of the data bits in the data frame are set.

[0031] Serial communication is carried out according to each bit. Before the communication, the sender and the receiver should agree on the sequence and meaning of the transmitted data. For example, bits 1 to A1 are the type of the data frame, bits (A1+1) to A2 are the length of the data in this frame, and then the payload data of the data in this frame. At the same time, it is also necessary to make an agreement on whether the data is transmitted from low to high or from high to low, so that the receiver can correctly interpret the data transmitted by the sender.

[0032] In the case of high data reliability requirements or poor transmission environment, a check value field can be added in the data frame, and the me...

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PUM

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Abstract

Carrying out data transmission based on signal line and ground wire between transmitter and receiver, the method in serial comm. includes parts and sequences: when not carrying comm. between transmitter and receiver, maintaining signal line at first level; transmitter sets signal line to second level, and after maintains prearranged time lengths of start bit, data 1, or 0, restores level to first level to indicate starting comm. data 1, or 0. There are different time lengths among start bit, data 1, or 0. The disclosed interface circuit includes interface circuits of transmitter and receiver. Signal lines and ground wire are connected between interface circuits. When transmitting end has no input or is in high level, the receiving end is in high level; when low level is inputted to the transmitting end, the receiving end is at low level. The invention enhances interference-killing feature for serial comm. without need of transmitter and receiver of possessing same reference clock.

Description

technical field [0001] The invention relates to a serial communication method and an interface circuit for realizing the method. Background technique [0002] Household appliances usually have a control board including a single-chip microcomputer and an integrated circuit, which are used to automatically control the operation of the household appliances. As the functions of household appliances are gradually enhanced, the control boards have to complete more and more tasks. Today's household appliances usually use two or more control boards. These control panels need to communicate with each other to coordinate and complete the control of the entire household appliance. [0003] Due to the requirement of low cost, the control boards of many household appliances do not have dedicated communication interfaces, and the number of interfaces available for communication is limited. In such cases, serial communication can only be performed with as few wires as possible. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/08H04L25/12H03K19/01
Inventor 孙奇辉李志罡李莉朱旬姜德志
Owner HAIER GRP CORP
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