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  https://wodewangzhishime.blogspot.com/2022/07/cai-yourong-spy.html . Ref: https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_11.html . . . John: OK. . Now, I create a parallel input of 0101. . Me: 0101 is a direct current (dc). . .  John : Correct. This direct current must be from the power supplier. . This direct current can't be from the network provider. . Me: ok.   I assume that there is serial input . This input is a direct current too.  This direct current is from network providers . . John: Correct.

  https://wodewangzhishime.blogspot.com/2022/06/what-does-he-need.html . Ref:  https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_70.html   . . John: Before we start, you're better read the 3 articles below. Me: OK. . 1) https://wodewangzhishime.blogspot.com/2022/02/httpswodewangzhishime_80.html 2) https://wodewangzhishime.blogspot.com/2022/02/httpswodewangzhishime_26.html 3) https://kamchihau.blogspot.com/2022/11/impact.html . John: In the monde, there're plenty protocol of communications. You might have a look .  https://instrumentationblog.com/communication-protocols/ . Me: OK. John: For example, RJ45, I2C, USB, SPI, and, so on and on. Me: OK. John: Now, we use I2C as an example. Me: OK. . John: At the picture above, do you see that there're 2 chips? They are Chip A and Chip B. Me: yes,. John: They use the interface of I2C to connect to each others. Me: OK. John: Chip A is master. Chip B is slave. That mean Chip B must use the clock line of Chip A. Me: