11-SPI - Serial Peripheral Interface(SPI(SPI ECE 2534...

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Serial Peripheral Interface (SPI) ECE 2534 1 Packet 11
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Motivation microcontroller needs to communicate ± A microcontroller needs to communicate with peripheral devices ± Data transfers can be ² serial Å one bit at a time ² or parallel Å several bits simultaneously ± Which alternative is faster ? ± Which alternative is cheaper to implement? 2
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Motivation arallel interconnections are usually ± Parallel interconnections are usually faster but more xpensive xtra wires extra pins) expensive (extra wires, extra pins) ± Some peripherals do not need high-speed data transfers! 3
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To clock, or not to clock ± Serial communication can be ynchronous ata + clock ² synchronous Å data clock r sychronous st the data; no clock ² or asychronous Å just the data; no clock hich of these is ster ± Which of these is faster ? ± Which of these is cheaper to implement? 4
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Serial Peripheral Interface (SPI) PIisastandardforfull uplex ± SPI is a standard for full-duplex, synchronous, serial communication ±
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This note was uploaded on 02/07/2011 for the course ECE 2534 taught by Professor Abbott during the Fall '10 term at Virginia Tech.

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11-SPI - Serial Peripheral Interface(SPI(SPI ECE 2534...

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