TOP MENUAsynchronous , Clock synchronous methods |
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Serial communication・CAN,LIN communication ・SENT communication ・USB Communication ・Ethernet ・SPI Communication ・Parity, Check sum, CRC ・Data transfer speed ・Clock synchronous, Asynchronous methods ・Differential Signaling Network communication・Message authentication, Digital signature |
・In Japanese
Asynchronous method and clock synchronous method are methods for recognizing the delimiter position of one data in serial communication. ■ Asynchronous methods
In this method, an identification signal is added to the start bit and stop bit of the transmission signal.
In general, the receiving side recognizes the start when 0 is received and the end when 1 is reached after a predetermined number of bits.
The receiving side reads the data multiple times at a faster cycle than the sending data so that no data is lost, and determines the correct value by majority vote.
In this method, a signal for identification is added to the original data, which reduces the transfer efficiency.
■Clock synchronous methods
In this method, another clock signal line is provided in addition to the transmission line, and the signal received at the same time as the clock is recognized as the beginning of the data. Since the recognition signal needs to be sent on a separate line, it takes up extra circuit space, but the transmission efficiency is better than the asynchronous method.
This method has weak resistance to noise, and when noise is added to the clock signal, the start position of the signal may be incorrect.
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