Asynchronous serial data line information transceiving method and asynchronous serial transceiver

Abstract

The invention relates to the field of data communication, in particular to an asynchronous serial data sending and receiving technology. The technical problem to be solved by the invention is to provide a method which does not depend on an external timer and can send and receive noncharacter information quantitatively and an asynchronous serial transceiver for realizing the method. The technical proposal adopted by the invention is as follows: a method for sending and receiving the asynchronous serial data line information, the asynchronous serial transceiver sends and receives character data information by the asynchronous serial data line are provided; the invention also includes steps of sending and receiving noncharacter information and provides the asynchronous serial transceiver for realizing the method, comprising a character transceiver and an interrupt controller which are connected, and also comprising a noncharacter information identifier and a quantitative receiving unit. The invention has the advantages that the asynchronous serial transceiver can directly send and receive a noncharacter information sequence and the realizing method reduces the system expenditure effectively and reduces the complexity of software compared with the prior method.

Description

technical field [0001] The invention relates to the field of data communication, in particular to asynchronous serial data sending and receiving technology. Background technique [0002] The information on the asynchronous serial data signal line includes character data information and non-character information, and the non-character information includes Idle sequence and Break sequence. The Idle sequence is a continuous logic 1, indicating that the interface data signal line is idle. The Break sequence is a sequence of logic 0s greater than or equal to one character length (including start and stop bits), used as an in-band control signal. [0003] Existing UARTs cannot quantitatively receive and transmit non-character information sequences independently. Such as figure 1 As shown, the Universal Asynchronous Transceiver (UART) includes a character transceiver and an interrupt controller. The receiving data signal line (RXD) is connected to the input end of the character ...

AI Technical Summary

Problems solved by technology

[0006] At present, the use of external timers to solve the problem of receiving and sending Idle sequences and Break sequences in asynchronous serial data communication requires a large system overhead, which greatly increases the complexity of the software, and will seriously reduce the performance of the system when controlling multiple asynchronous serial ports.

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