Why did SPI come up with these four modes?

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  Meilani Posted on 2020/6/27 17:06:08

  For different hardware boards, the SPI interface's up and down conditions may be inconsistent. In this case, SPI mode configuration is required. But now most of the usage patterns are just one of them. The reason is that there were hundreds of contentions at that time, and their design standards were different.

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  Mireille Posted on 2020/6/27 17:06:36

  Patent problems, such as the I2C of STM32, many people have problems, and they are designed to avoid problems with patent results.

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  Norah Posted on 2020/6/27 17:07:05

  Drivers of chips from different manufacturers are different. There are rising edge driving, falling edge driving, high and low level and so on. In order to be fully compatible, the 2 wires also have a maximum of 4 states.

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  Marley Posted on 2020/6/27 19:17:48

  Because there were many companies at the time, all with their own standards.

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  Orla Posted on 2020/6/28 2:07:31

  To be compatible with the design requirements of different manufacturers. 2 buses will have 4 states.

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