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===Data transmission===
[[File:SPI 8-bit circular transfer.svg|upright=1.8|thumb|A typical hardware setup using two [[shift register]]s to form an inter-chip [[circular buffer]]
To begin communication, the SPI master first selects a slave device by pulling its {{Overline|SS}} low. (The bar above {{Overline|SS}} indicates it is an [[active low]] signal, so a low voltage means "selected", while a high voltage means "not selected")
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