Itron Interview Question: what is SPI... | Glassdoor

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Senior Design Engineer Interview West Union, SC

what is SPI

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"SPI" stands for "serial peripheral interface. It requires 1 clock, two data lines, and one "slave select" per chip being controlled. There is one "master" and 1 or more slaves. So the total number of wires is 3+N, where N = number of slaves. MOSI = master data output, slave input. MISO = master data input, slave output.

There are different selection modes, but typically a slave is active when SS = low, or sometimes on the falling edge.

SPI interface on Aug 17, 2016

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