sequential (57) I2C and SPI protocol
https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_10.html?m=1 . Ref: https://kamchihau.blogspot.com/2022/09/different-frequency.html . . . John: There're many type of protocol of communication . You might have a look . https://instrumentationblog.com/communication-protocols/ . // . For example, RJ45, I2C, USB, SPI, RS232, so on and on. Me: Ok. John: We use the protocol of SPI as an example. Look at the picture above. The slave of SPI use the clock line of the master. Me: OK. John: Normally, the master of SPI choose the clock line of the system. However, hacker hack it. It Become, . Subject [Master of SPI] Interrupt [The clock line of RJ45] <---- Originally it is The clock line of the System. Object [] Value [pending] . John: If there's carrier wave on the clock line of RJ45 of the master, those carrier wave enter the Slave cause the slave use the clock line of RJ45 too.