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Embedded Systems Architecture by Daniele Lacamera

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SPI

A different approach is SPI. Introduced in the late 1980s, this technology aimed to replace asynchronous serial communication towards peripherals, by introducing a number of improvements:

  • Serial clock line to synchronize the endpoints
  • Master-slave protocol
  • One-to-many communication over the same three-wire bus

The master device, usually the microcontroller, shares the bus with one or more slaves. To trigger the communication, a separate slave select (SS) signal is used to address each slave connected to the bus. The bus uses two independent signals for data transfer, one per direction, and a shared clock line that synchronizes the two ends of the communication. Due to the clock line being generated by the master, the data transfer is ...

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