sequential (57) I2C and SPI protocol

 https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_70.html

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Ref: https://kamchihau.blogspot.com/2022/09/different-frequency.html . 

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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,

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Subject [Master of SPI]

Interrupt [The clock line of RJ45] <---- Originally it is The clock line of the System. 

Object []

Value [pending]

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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.